osd/bluestore: Actually wait until completion in write_sync

osd/bluestore: Actually wait until completion in write_sync

This function is only used by RocksDB WAL writing so it must sync data.

This fixes #18338 and thus allows to actually set `bluefs_preextend_wal_files`
to true, gaining +100% single-thread write iops in disk-bound (HDD or bad SSD) setups.
To my knowledge it doesn't hurt performance in other cases.
Test it yourself on any HDD with `fio -ioengine=rbd -direct=1 -bs=4k -iodepth=1`.

Issue #18338 is easily reproduced without this patch by issuing a `kill -9` to the OSD
while doing `fio -ioengine=rbd -direct=1 -bs=4M -iodepth=16`.

Fixes: https://tracker.ceph.com/issues/18338 https://tracker.ceph.com/issues/38559
Signed-off-by: Vitaliy Filippov <vitalif@yourcmc.ru>