test: add cleanup for cron test; fix formatting

Ensure cron test restores state of crontab after test.
Fix formatting in a few places.
Do not check ansible managed header and fingerprint unless the test
uses a custom template with header and fingerprint.
Use default for gather_facts unless otherwise needed.

Signed-off-by: Rich Megginson <rmeggins@redhat.com>

tests/tests_deploy.yml

@@ -2,14 +2,17 @@
 ---
 - name: Ensure that the role runs with default parameters
   hosts: all
-  gather_facts: false  # test that role works in this case
   roles:
     - role: linux-system-roles.aide
       vars:
         aide_init: true
   tasks:
-    - name: Check header for ansible_managed, fingerprint
-      include_tasks: tasks/check_not_present_header.yml
-      vars:
-        __file: /etc/aide.conf
-        __fingerprint: system_role:aide
+    - name: Check if the file exists
+      ansible.builtin.stat:
+        path: /etc/aide.conf
+      register: file_check
+
+    - name: Assert that the file exists
+      ansible.builtin.assert:
+        that: file_check.stat.exists
+        fail_msg: The file does not exist.