avformat/mux: remove unnecessary autobsf hack

autobsf has been ported to the new bsf API.
Signed-off-by: James Almer <jamrial@gmail.com>

libavformat/mux.c

@@ -309,12 +309,6 @@ FF_DISABLE_DEPRECATION_WARNINGS
 FF_ENABLE_DEPRECATION_WARNINGS
 #endif
 
-        /* update internal context from codecpar, old bsf api needs this
-         * FIXME: remove when autobsf uses new bsf API */
-        ret = avcodec_parameters_to_context(st->internal->avctx, st->codecpar);
-        if (ret < 0)
-            goto fail;
-
         if (!st->time_base.num) {
             /* fall back on the default timebase values */
             if (par->codec_type == AVMEDIA_TYPE_AUDIO && par->sample_rate)