fix: Kicker's sub-menus are covered up by Plasma panels

Pairing commit for P-W

BUG: 378694


(cherry picked from commit da7ddbb6)

src/windowsystem/windowsystem.cpp

@@ -463,6 +463,7 @@ void WindowSystem::setType(WId win, NET::WindowType windowType)
         role = KWayland::Client::PlasmaShellSurface::Role::Notification;
         break;
     case NET::Tooltip:
+    case NET::PopupMenu:
         role = KWayland::Client::PlasmaShellSurface::Role::ToolTip;
         break;
     case NET::CriticalNotification: