Buttons at additional setting are now same size

ubl-settings-usergroups-additional-settings.glade

@@ -352,6 +352,7 @@
             <property name="can-focus">False</property>
             <property name="halign">end</property>
             <property name="spacing">5</property>
+            <property name="homogeneous">True</property>
             <child>
               <object class="GtkButton" id="CancelButton">
                 <property name="label" translatable="yes">Cancel</property>