Increased confirmation window minimal width

ubl-settings-usergroups-confirmation.glade

@@ -30,7 +30,7 @@
     </columns>
   </object>
   <object class="GtkWindow" id="Window">
-    <property name="width-request">450</property>
+    <property name="width-request">650</property>
     <property name="height-request">300</property>
     <property name="can-focus">False</property>
     <property name="modal">True</property>