opengl: remove orientation hack

Now that the Android interop does not change the format orientation
anymore, the orientation is never changed by interops, so the hack can
be safely removed.

modules/video_output/opengl/vout_helper.c

@@ -178,11 +178,7 @@ vout_display_opengl_t *vout_display_opengl_New(video_format_t *fmt,
      && vout_display_opengl_SetViewpoint(vgl, viewpoint) != VLC_SUCCESS)
         goto delete_sub_renderer;
 
-    video_orientation_t orientation = fmt->orientation;
     *fmt = vgl->interop->fmt;
-    /* The orientation is handled by the orientation matrix: from the core
-     * point of view, it does not change. */
-    fmt->orientation = orientation;
 
     if (subpicture_chromas) {
         *subpicture_chromas = gl_subpicture_chromas;