Objecter::_recalc_linger_op: resend for any acting set change

Fixes: #9220
Backport: firefly
Signed-off-by: Samuel Just <sam.just@inktank.com>
Merge pull request #2453 from athanatos/wip-9220

Objecter::_recalc_linger_op: resend for any acting set change

Reviewed-by: Sage Weil <sage@redhat.com>