[epiphany] prefs-dialog: Make the notebook scrollable

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 15c1ef531476da250538e7807476339bb7151862
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Tue Jun 25 20:43:50 2019 +0200

    prefs-dialog: Make the notebook scrollable
    
    This will allow the window to reach narrow widths.

 src/resources/gtk/prefs-dialog.ui | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/resources/gtk/prefs-dialog.ui b/src/resources/gtk/prefs-dialog.ui
index 4f489e18c..0d83f0d9a 100644
--- a/src/resources/gtk/prefs-dialog.ui
+++ b/src/resources/gtk/prefs-dialog.ui
@@ -25,6 +25,7 @@
         <child>
           <object class="GtkNotebook" id="notebook">
             <property name="visible">True</property>
+            <property name="scrollable">True</property>
             <property name="show_border">False</property>
             <child>
               <object class="HdyPreferencesPage">