Revert "decode: copy the output parameters from the last bsf in the chain back to the AVCodecContext"

This reverts commit 662558f985.

The avcodec_parameters_to_context() call was freeing and reallocating
AVCodecContext->extradata, essentially taking ownership of it, which according
to the doxy is user owned. This is an API break and has produces crashes in
some library users like Firefox.
Revert until a better solution is found to internally propagate the filtered
extradata back into the decoder context.

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

libavcodec/decode.c

@@ -221,10 +221,6 @@ int ff_decode_bsfs_init(AVCodecContext *avctx)
             goto fail;
     }
 
-    ret = avcodec_parameters_to_context(avctx, s->bsfs[s->nb_bsfs - 1]->par_out);
-    if (ret < 0)
-        return ret;
-
     return 0;
 fail:
     ff_decode_bsfs_uninit(avctx);