Make disabling unused filesystems idempotent

The `os_unused_filesystems` was lacking sorting, making the task not
idempotent. This was especially apparent and random in Molecule tests
when this collection was added as a dependency.

Signed-off-by: Aki Kanellis <[email protected]>

roles/os_hardening/templates/etc/modprobe.d/modprobe.j2

@@ -1,6 +1,6 @@
 {{ ansible_managed | comment }}
 # Generated by Ansible role {{ ansible_role_name }}
 
-{% for fs in os_unused_filesystems | difference(os_filesystem_whitelist) %}
+{% for fs in os_unused_filesystems | difference(os_filesystem_whitelist) | sort %}
 install {{fs}} /bin/true
 {% endfor %}