[fractal] main_window: Remove manual GtkViewport use

[Daniel Garcia Moreno <danigm src gnome org>]

commit 86fa6700cdd78e0d87f8efd3016b4c99b822682f
Author: Christopher Davis <brainblasted disroot org>
Date:   Sat Oct 31 16:43:21 2020 -0700

    main_window: Remove manual GtkViewport use
    
    GtkViewports are automatically added by GtkScrolledWindow

 fractal-gtk/res/ui/main_window.ui | 40 +++++++++++++--------------------------
 1 file changed, 13 insertions(+), 27 deletions(-)
---
diff --git a/fractal-gtk/res/ui/main_window.ui b/fractal-gtk/res/ui/main_window.ui
index dce3b1d1..4c74f785 100644
--- a/fractal-gtk/res/ui/main_window.ui
+++ b/fractal-gtk/res/ui/main_window.ui
@@ -148,22 +148,14 @@
                                 <property name="vexpand">True</property>
                                 <property name="hscrollbar_policy">never</property>
                                 <child>
-                                  <object class="GtkViewport">
-                                    <property name="width_request">200</property>
+                                  <object class="GtkBox" id="room_container">
                                     <property name="visible">True</property>
                                     <property name="can_focus">False</property>
-                                    <property name="shadow_type">none</property>
-                                    <child>
-                                      <object class="GtkBox" id="room_container">
-                                        <property name="visible">True</property>
-                                        <property name="can_focus">False</property>
-                                        <property name="orientation">vertical</property>
-                                        <style>
-                                          <class name="rooms-sidebar"/>
-                                          <class name="sidebar"/>
-                                        </style>
-                                      </object>
-                                    </child>
+                                    <property name="orientation">vertical</property>
+                                    <style>
+                                      <class name="rooms-sidebar"/>
+                                      <class name="sidebar"/>
+                                    </style>
                                   </object>
                                 </child>
                               </object>
@@ -588,25 +580,19 @@
                                 <property name="halign">fill</property>
                                 <property name="valign">fill</property>
                                 <child>
-                                  <object class="GtkViewport">
-                                    <property name="visible">True</property>
+                                  <object class="GtkStack" id="directory_stack">
                                     <property name="can_focus">False</property>
                                     <child>
-                                      <object class="GtkStack" id="directory_stack">
+                                      <object class="GtkBox" id="directory_spinner">
+                                        <property name="visible">True</property>
                                         <property name="can_focus">False</property>
                                         <child>
-                                          <object class="GtkBox" id="directory_spinner">
+                                          <object class="GtkSpinner">
                                             <property name="visible">True</property>
                                             <property name="can_focus">False</property>
-                                            <child>
-                                              <object class="GtkSpinner">
-                                                <property name="visible">True</property>
-                                                <property name="can_focus">False</property>
-                                                <property name="active">True</property>
-                                                <property name="hexpand">True</property>
-                                                <property name="vexpand">True</property>
-                                              </object>
-                                            </child>
+                                            <property name="active">True</property>
+                                            <property name="hexpand">True</property>
+                                            <property name="vexpand">True</property>
                                           </object>
                                         </child>
                                       </object>