Set original framesize on the spu format for nero vobsubs in mp4, so that...

Set original framesize on the spu format for nero vobsubs in mp4, so that rescaling will work for videos in a cropped resolution compared to the vobsubs

modules/demux/mp4/mp4.c

@@ -1359,6 +1359,10 @@ static int TrackCreateES( demux_t *p_demux, mp4_track_t *p_track,
                 if( p_track->fmt.i_cat == SPU_ES )
                 {
                     p_track->fmt.i_codec = VLC_FOURCC( 's','p','u',' ' );
+                    if( p_track->i_width > 0 )
+                        p_track->fmt.subs.spu.i_original_frame_width = p_track->i_width;
+                    if( p_track->i_height > 0 )
+                        p_track->fmt.subs.spu.i_original_frame_height = p_track->i_height;
                     break;
                 }
             /* Fallback */