matrix-backup-borg: add readability and ease of use to code

roles/matrix-backup-borg/defaults/main.yml

@@ -51,7 +51,7 @@ matrix_backup_borg_encryption: repokey-blake2
 matrix_backup_borg_ssh_key_private: ""
 
 # allow unencrypted repo access
-matrix_backup_borg_unknown_unencrypted_repo_access_is_ok: false
+matrix_backup_borg_unknown_unencrypted_repo_access_is_ok: "{{ matrix_backup_borg_encryption == 'none' }}"
 
 # borg ssh command with ssh key
 matrix_backup_borg_storage_ssh_command: ssh -o "StrictHostKeyChecking accept-new" -i /etc/borgmatic.d/sshkey

roles/matrix-backup-borg/tasks/validate_config.yml

@@ -12,4 +12,4 @@
   fail:
     msg: >-
       You need to define a required passphrase.
-  when: "matrix_backup_borg_storage_encryption_passphrase == '' and not matrix_backup_borg_encryption == 'none'"
+  when: "matrix_backup_borg_storage_encryption_passphrase == '' and matrix_backup_borg_encryption != 'none'"