popupMenu: Never add ornament padding to image items

PopupImageMenuItem moves the ornament after the label, so we don't
need the additional padding that accounts for visible ornaments
for regular items.

Spotted by Sebastian Keller.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2843>

js/ui/popupMenu.js

@@ -474,6 +474,11 @@ class PopupImageMenuItem extends PopupBaseMenuItem {
         else
             this._icon.icon_name = icon;
     }
+
+    _updateOrnamentStyle() {
+        // we move the ornament after the label, so we don't need
+        // additional padding regardless of ornament visibility
+    }
 });
 
 var PopupMenuBase = class extends Signals.EventEmitter {