sub: force segment switch if video is already ahead

In particular, this prevents subtitle packets from building up in the
subtitle queue if e.g. --vo=null is used. In this situation,
sub_get_bitmaps() is never called, and thus the segment never switched.

This also seems to help with flickering at segment switch boundaries (if
subs are supposed to be visible at the transition points).

In theory, this could trigger a switch too early, but the way VO and
subtitle renderer interact wrt. timing is a bit iffy anyway.

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