obs-ffmpeg: Fix locale typo

plugins/obs-ffmpeg/data/locale/en-US.ini

@@ -36,7 +36,7 @@ ColorRange.Auto="Auto"
 ColorRange.Partial="Partial"
 ColorRange.Full="Full"
 RestartMedia="Restart Media"
-SpeedPercentage="Speed (perecent)"
+SpeedPercentage="Speed (percent)"
 Seekable="Seekable"
 
 MediaFileFilter.AllMediaFiles="All Media Files"