[polari] roomListHeader: Use Popover instead of PopoverMenu

[Marge Bot <marge-bot src gnome org>]

commit dd1fc3ed64576a021bbd979d175a00b7b7acc989
Author: Florian Müllner <fmuellner gnome org>
Date:   Mon Aug 23 15:06:21 2021 +0200

    roomListHeader: Use Popover instead of PopoverMenu
    
    In GTK4, PopoverMenu is more or less assumed to be generated from
    a menu model, while Popover is more suitable for manually created
    UIs.
    
    Part-of: <https://gitlab.gnome.org/GNOME/polari/-/merge_requests/225>

 data/resources/room-list-header.ui | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/data/resources/room-list-header.ui b/data/resources/room-list-header.ui
index 06e0ec24..b6bc86a2 100644
--- a/data/resources/room-list-header.ui
+++ b/data/resources/room-list-header.ui
@@ -90,7 +90,7 @@
       </object>
     </child>
   </template>
-  <object class="GtkPopoverMenu" id="connectionPopover">
+  <object class="GtkPopover" id="connectionPopover">
     <property name="position">bottom</property>
     <child>
       <object class="GtkBox">