fftools/ffmpeg_enc: unbreak -force_key_frames source_no_drop

Unlike the 'source' mode, which preserves source keyframe-marking as-is,
the 'source_no_drop' mode attempts to keep track of keyframes dropped by
framerate conversion and mark the next output frame as key in such
cases. However,
* c75be061487 broke this functionality entirely, and made it equivalent
  to 'source'
* even before it would only work when the frame immediately following
  the dropped keyframe is preserved and not dropped as well

Also, drop a redundant check for 'frame' in setting dropped_keyframe, as
it is redundant with the check on the above line.

0 files changed, 0 insertions, 0 deletions