[krb5-auth-dialog] main-window: It's a popover, not a menu

[Guido Günther <guidog src gnome org>]

commit 9982d749ac429ea72709ba743bf7ef3ee818ceb1
Author: Guido Günther <agx sigxcpu org>
Date:   Thu Oct 13 19:03:30 2022 +0200

    main-window: It's a popover, not a menu
    
    Noticed by GTK4

 src/resources/ui/ka-main-window.ui | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/resources/ui/ka-main-window.ui b/src/resources/ui/ka-main-window.ui
index 8b53e83..3d27c45 100644
--- a/src/resources/ui/ka-main-window.ui
+++ b/src/resources/ui/ka-main-window.ui
@@ -2,7 +2,7 @@
 <!-- Generated with glade 3.20.0 -->
 <interface>
   <requires lib="gtk+" version="3.14"/>
-  <object class="GtkPopoverMenu" id="menu_main">
+  <object class="GtkPopover" id="menu_main">
     <child>
       <object class="GtkBox">
         <property name="visible">True</property>