avcodec: do not clobber the direct rendering flag

The direct rendering flag used to gated certain code paths from
hardware decoding. Nowadays, the flag is not checked when hardware
decoding is active, so there are no needs to clobber it anymore.

This allows using direct rendering when falling back from hardware
decoding to software decoding.

modules/codec/avcodec/video.c

@@ -1160,10 +1160,6 @@ static enum PixelFormat ffmpeg_GetFormat( AVCodecContext *p_context,
         if (va->description != NULL)
             msg_Info(p_dec, "Using %s for hardware decoding", va->description);
 
-        /* FIXME this will disable direct rendering
-         * even if a new pixel format is renegotiated
-         */
-        p_sys->b_direct_rendering = false;
         p_sys->p_va = va;
         p_context->draw_horiz_band = NULL;
         return pi_fmt[i];