[TIDY] Set some "diff: false", fix linter warnings

tasks/borgbackup-Debian.yml

@@ -7,13 +7,14 @@
 
 # For all other Debian versions, simply install borgbackup
 
-- name: borgbackup - Install borgbackup
+- name: Borgbackup - Install borgbackup
   when:
     - borgbackup_passphrase is defined
     - borgbackup_repo is defined
     - borgbackup_hostname is defined
     - ansible_distribution_release != 'stretch'
-  become: yes
+  become: true
   ansible.builtin.apt:
     name: borgbackup
     state: present
+  diff: false