Use the application provided display.

The xvba-video wrapper used a local X11 connection. However this prevents
using overlays on the application provided X11 display to be shown.

src/xvba_video_glx.c

@@ -182,9 +182,12 @@ static void *render_thread(void *arg)
         obj_output->render_thread_ok = 0;
         return NULL;
     }
-#else
+#elif 0
     /* Use the xvba-video global X11 display */
     Display * const x11_dpy = driver_data->x11_dpy_local;
+#else
+    /* Use the application provided display */
+    Display * const x11_dpy = driver_data->x11_dpy;
 #endif
 
     ASSERT(obj_output->render_context);