[client] wayland: invalidate window on configure

This avoids sending potentially meaningless damage values after a surface
configuration event.

client/displayservers/Wayland/shell_xdg.c

@@ -46,6 +46,7 @@ static void xdgSurfaceConfigure(void * data, struct xdg_surface * xdgSurface,
   {
     wlWm.needsResize  = true;
     wlWm.resizeSerial = serial;
+    app_invalidateWindow();
   }
   else
   {