data: Add *.LRF glob to MPEG-4 videos

This file is generated as a preview/playback version of videos on DJI hardware: “this is a low-resolution file generated simultaneously when recording, and LRF files are MP4, which can be viewed by any media player”

See https://forum.dji.com/forum.php?mod=redirect&goto=findpost&ptid=303803&pid=3207373