mgr/cephadm: use double quotes for NFSv4 RecoveryBackend in ganesha conf
This came directly from someone on the ganesha team. We've actually had
this use single quotes for a long time (at least since mid 2020) but I
believe recent feature work on the ganesha side exposed the issue
ganesha.nfsd-2[main] config_errs_to_log :CONFIG :WARN :Config File (/etc/ganesha/ganesha.conf:13): Unknown token ('rados_cluster')
Fixes: https://tracker.ceph.com/issues/69930
Signed-off-by: Adam King <adking@redhat.com>
(cherry picked from commit
4f5aa60c5d7605444b76485a473749d06ee65694)