[gnome-control-center] notifications: Make dialog resizeable, adjust default size

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit a8bc1a222e965c60438e82b292bc7a2418389a1a
Author: Christopher Davis <christopherdavis gnome org>
Date:   Tue Feb 8 21:48:44 2022 -0800

    notifications: Make dialog resizeable, adjust default size
    
    We can't use flat headerbars here because we need to
    be able to scroll the dialog at smaller sizes. We
    also need for the dialog to be able to reach smaller
    sizes.

 panels/notifications/cc-app-notifications-dialog.ui | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)
---
diff --git a/panels/notifications/cc-app-notifications-dialog.ui 
b/panels/notifications/cc-app-notifications-dialog.ui
index dfc7d4a26..9853ec03b 100644
--- a/panels/notifications/cc-app-notifications-dialog.ui
+++ b/panels/notifications/cc-app-notifications-dialog.ui
@@ -2,16 +2,9 @@
 <interface>
   <template class="CcAppNotificationsDialog" parent="GtkDialog">
     <property name="default-width">550</property>
-    <property name="resizable">False</property>
+    <property name="default-height">450</property>
+    <property name="resizable">True</property>
     <property name="modal">True</property>
-    <child type="titlebar">
-      <object class="GtkHeaderBar">
-        <property name="show-title-buttons">True</property>
-        <style>
-          <class name="flat" />
-        </style>
-      </object>
-    </child>
     <child>
       <object class="AdwPreferencesPage">
         <child>