fs2bs: fix wrong filter when setting osd_ids

fs2bs: fix wrong filter when setting osd_ids

using 'match' filter in that task will lead to bad behavior if I have
the following node names for instance:

- node1
- node11
- node111

with `selectattr('name', 'match', inventory_hostname)` it will match
'node1' along with 'node11' and 'node111'.

using 'equalto' filter will make sure we only match the target node.

Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1963066
Signed-off-by: Guillaume Abrioux <gabrioux@redhat.com>
(cherry picked from commit 0990ae41099d8b9d678f546fc8790033f421711f)