mon: mark pgtemp messages as no_reply more consistently in preprocess_pgtemp

mon: mark pgtemp messages as no_reply more consistently in preprocess_pgtemp

If a message is forwarded, it's conceivable the leader's and peon's evaluation
will disagree about whether the message is useful or not, which could result
in the leader ignoring it and the peon having a dangling forwarded message.
Fix this by marking the op as no_reply whenever ignoring it.

Fixes:  https://tracker.ceph.com/issues/46914
Signed-off-by: Greg Farnum <gfarnum@redhat.com>