cephadm: fix osd size reported in 'orch ls'
The current code enforces ('running osds' + 1), see [1].
Let's simply print the number of running osds instead of a
meaningless calculation.
[1] https://github.com/ceph/ceph/commit/
1c0a0a6f6153dc555085f263f161666cd171964a#diff-4f2fb7d330e74b64ac41457b7c7a723cd78db86433e0b0c398874531e5a7e39eR1852-R1859
Fixes: https://tracker.ceph.com/issues/50928
Signed-off-by: Guillaume Abrioux <gabrioux@redhat.com>
(cherry picked from commit
97219591dab8f54f239ccfb1891c45b01e7bec79)