ffmpeg: Remove hw_device_ctx output filter reinit hack

This was skipped in c17563c5d3 because
it depended on the filter setup merge, but was forgotten after that
actually happened.

Fixes hwaccel fate for stream size change tests.

ffmpeg_filter.c

@@ -460,7 +460,7 @@ static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter,
     if (ret < 0)
         return ret;
 
-    if (!hw_device_ctx && (ofilter->width || ofilter->height)) {
+    if (ofilter->width || ofilter->height) {
         char args[255];
         AVFilterContext *filter;
         AVDictionaryEntry *e = NULL;