movenc: Remove a leftover commented out line

This line originates from 6f69f7a8bf6a0d013985578df2ef42ee6b1c7994.

Signed-off-by: Martin Storsjö <martin@martin.st>

libavformat/movenc.c

@@ -1175,8 +1175,6 @@ static int get_samples_per_packet(MOVTrack *track)
 {
     int i, first_duration;
 
-// return track->par->frame_size;
-
     /* use 1 for raw PCM */
     if (!track->audio_vbr)
         return 1;