command: remove ifdefs for deint filters

Doesn't have much of a purpose.
vo: fix previous commit

Commit 433161 actually broke vo_opengl (and maybe others), because
config_ok is not necessarily set correctly yet _during_ reconfig. So a
vo_get_src_dst_rects() call during reconfig did nothing.
options: fix "-" (stdin) input

Input through stdin requires disabling the terminal layer, and commit
32c63f forgot to rename the option correctly.