nautilus: osd/PeeringState: fix acting_set_writeable min_size check
This is a nautilus only manual backport of
https://github.com/ceph/ceph/pull/40572
which is itself composed of commits
7b2e0f4fd1c9071495dae9189428aa1cb8774c30
642a1c165499bcbd4cfdf907af313ac7ffe44ff4
The backport did not apply cleanly because these call have
been factored out into PeeringState.cc in octopus and newer.
The original callers have been fixed in PG.cc.
Fixes: https://tracker.ceph.com/issues/50153
Signed-off-by: Dan van der Ster <daniel.vanderster@cern.ch>