null-sink: Recalculate max_request and max_rewind while resuming sink
requested to merge igor.v.kovalenko/pulseaudio:pr/null-sink-recalculate-max-request-rewind-while-unsuspending into master
When sink is suspended for reconfiguration changing sample spec, upon resume internal thread_info max_request and max_rewind are out of date and possibly not aligned to frame size anymore.
Recalculate thread max_request and max_rewind before resuming sink.
This fixes the crash reported here https://bugs.gentoo.org/821271