h263dec: Force padding bug workaround for H.263.

Fixes decoding of http://samples.mplayerhq.hu/V-codecs/h263/h263-raw/messenger.h263Signed-off-by: NAnton Khirnov <anton@khirnov.net>

libavcodec/h263dec.c

@@ -316,7 +316,8 @@ static int decode_slice(MpegEncContext *s)
     }
 
     if (s->workaround_bugs & FF_BUG_AUTODETECT) {
-        if (s->padding_bug_score > -2 && !s->data_partitioning)
+        if (s->codec_id == AV_CODEC_ID_H263 ||
+            (s->padding_bug_score > -2 && !s->data_partitioning))
             s->workaround_bugs |= FF_BUG_NO_PADDING;
         else
             s->workaround_bugs &= ~FF_BUG_NO_PADDING;