sub/sd_lavc: don't check endpts when getting subs

When getting subtitles, sd_lavc checks if the current pts plus a small
offset (1e-6) is greater than the sub->pts as well as checking if the
pts is less than the sub->endpts. The problem with the endpts check is
that there are subtitles out there (pgs ones) that have overlapping
durations and thus you'll get a case where pts is greater than endpts
because a new subtitle shows up. However, the old subtitle is still
meant to be on the screen. This results in a flickering effect where the
subtitle flashes and then appears the next frame. The easy enough fix is
to just loosen the condition and remove the endpts check altogether.
That ensures that the subtitle remains selected for the entire duration.
Unsure if this possibly could regress some other kind of subtitle out
that that uses sd_lavc, but this does appear to fix a real issue with
pgs subtitles. Fixes #8202 and #10051.

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