avformat: Copy properties from internal context

Fixes Ticket5467 "Lossless j2k information no longer shown"

Based on suggestion by Hendrik Leppkes
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/utils.c

@@ -3805,6 +3805,9 @@ FF_DISABLE_DEPRECATION_WARNINGS
             memcpy(st->codec->subtitle_header, st->internal->avctx->subtitle_header,
                    st->codec->subtitle_header_size);
         }
+
+        // Fields unavailable in AVCodecParameters
+        st->codec->properties = st->internal->avctx->properties;
 FF_ENABLE_DEPRECATION_WARNINGS
 #endif