Destroy frame queue before display

wl_event_queue_destroy accesses the display.
Found by running a test under valgrind.

Pick-to: 6.5
Change-Id: Ic89cbd3b6e98b4fc9561b0e63b5fab4886a1ec50
Reviewed-by: David Edmundson <davidedmundson@kde.org>

src/plugins/platforms/wayland/qwaylanddisplay.cpp

@@ -370,11 +370,12 @@ QWaylandDisplay::~QWaylandDisplay(void)
 #if QT_CONFIG(cursor)
     mCursorThemes.clear();
 #endif
-    if (mDisplay)
-        wl_display_disconnect(mDisplay);
 
     if (m_frameEventQueue)
         wl_event_queue_destroy(m_frameEventQueue);
+
+    if (mDisplay)
+        wl_display_disconnect(mDisplay);
 }
 
 // Steps which is called just after constructor. This separates registry_global() out of the constructor