player: use canonical playback time for video refreshes

When changing video filters during initialization, there was a small
time window where video was initialized, but playback restart was not
complete yet. In this time window, playback_pts is not set. But since
issue_refresh_seek() was using this, it could lead to no refresh being
done _if_ the "video" had only 1 frame (such as cover art).

Fix this by using get_current_time() instead, which is the current time
with corner cases such as ongoing loading or seeks taken into account.

See also the previous commit. Without that, get_current_time() could
return NOPTS during init.

Fixes #5831.

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