osd/scrub: allow auto-repair on operator-initiated scrubs

osd/scrub: allow auto-repair on operator-initiated scrubs

Previously, operator-initiated scrubs would not auto-repair, regardless
of the value of the 'osd_scrub_auto_repair' config option.  This was
less confusing to the operator than it could have been, as most
operator commands would in fact cause a regular periodic scrub
to be initiated. However, that quirk is now fixed: operator commands
now trigger 'op-initiated' scrubs. Thus the need for this patch.

Signed-off-by: Ronen Friedman <rfriedma@redhat.com>