ceph: update blockPoolChannel before starting the mirror monitoring
ceph: update blockPoolChannel before starting the mirror monitoring

update blockPoolChannel monitoringRunning field to `true` before
starting the goroutine to monitor mirroring

Signed-off-by: Santosh Pillai <a9a1d71426d37777113fca9df086b5a94f580e95@redhat.com>

rook/rook,rook/nfs,rook/rook,rook/nfs,rook/rook,rook/rook,rook/nfs,rook/rook