server: Fix --autoplay-delay.

server: Fix --autoplay-delay.

init_vss_task() is called before the scheduler has initialized the
timeval available everywhere through the global now pointer. Hence,
in this function ->now is {0, 0}, and the computed autoplay barrier
will be in the past, effectively making --autoplay-delay a no-op.

Fix this by calling clock_get_realtime() to get the current time.