shrink-osd: fix regression because of a wrong regex
shrink-osd: fix regression because of a wrong regex

968891f4498da9625acfdd34bfb01fe445d1eef2 introduced a regression.
The regex is wrong because it doesn't allow to shrink osds with id
greater than 9

Fixes: #6950

Signed-off-by: Per Abildgaard Toft <8205aed0c460f4ecd16c764157a7dd5afa286b11@minfejl.dk>

ceph/ceph-ansible,ceph/ceph-ansible