[zenity: 1/2] src/zenity.ui: add default OK button for --scale

[Logan Rathbone <larathbone src gnome org>]

commit 52447eed99f7b0f82d6d9180df246ae28cff65d2
Author: hydrargyrum <50685-hydrargyrum users noreply gitlab gnome org>
Date:   Sun Apr 24 15:07:11 2022 +0000

    src/zenity.ui: add default OK button for --scale
    
    It's now possible to just press "Enter" to accept the selected value.

 src/zenity.ui | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/zenity.ui b/src/zenity.ui
index 13594422..2311340b 100644
--- a/src/zenity.ui
+++ b/src/zenity.ui
@@ -46,6 +46,7 @@
                 <property name="can_focus">True</property>
                 <property name="can_default">True</property>
                 <property name="receives_default">False</property>
+                <property name="has_default">True</property>
               </object>
               <packing>
                 <property name="expand">False</property>