Revert "osd/PG: avoid choose_acting picking want with > pool size items"

Revert "osd/PG: avoid choose_acting picking want with > pool size items"

This reverts commit a0d49cf83ae3b845f2724aec28234d8796c66747.

c3e2990c39952a1fc4593076c5b2f0dea6cdcdd3 was backported to mimic by a0d49cf83ae3b845f2724aec28234d8796c66747.
In master, c3e2990c39952a1fc4593076c5b2f0dea6cdcdd3 was reverted by 82bb83f0ba930d7f83bea5a5397629b3e334bae2.

The revert is not cherry-picked from master because it's better to
revert the mimic backport directly.

Signed-off-by: Nathan Cutler <ncutler@suse.com>