mon/OSDMonitor: fixup sortbitwise flag warning

mon/OSDMonitor: fixup sortbitwise flag warning

"ceph -s" does not report warning when using
command "ceph osd unset sortbitwise" to drop
sortbitwise flag.
we should use "osdmap.get_up_osd_features() &
CEPH_FEATURE_OSD_BITWISE_HOBJ_SORT"
instead of "(osdmap.get_features(CEPH_ENTITY_TYPE_OSD, NULL) &
CEPH_FEATURE_OSD_BITWISE_HOBJ_SORT)",
because osdmap.get_features only get local "features"

Signed-off-by: huanwen ren <ren.huanwen@zte.com.cn>
(cherry picked from commit c25ee187e28724846d0011cd8145e16956d3636e)