avcodec/pthread_frame: also keep AVCodecContext.properties in sync between threads

Some frame threaded decoders set it, but this information never reached the
caller in frame threading scenarios.

Signed-off-by: James Almer <jamrial@gmail.com>

libavcodec/pthread_frame.c

@@ -277,6 +277,7 @@ static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src,
 
         dst->has_b_frames = src->has_b_frames;
         dst->idct_algo    = src->idct_algo;
+        dst->properties   = src->properties;
 
         dst->bits_per_coded_sample = src->bits_per_coded_sample;
         dst->sample_aspect_ratio   = src->sample_aspect_ratio;