Fixed unnecessary checking of user attributes, added check for matrix_jitsi_enable_auth boolean

roles/matrix-jitsi/tasks/validate_config.yml

@@ -35,9 +35,9 @@
       These defaults are insecure. Jitsi should be rebuilt with secure values.
       Refer to the "Rebuilding your Jitsi installation" section in our setup instructions (docs/configuring-playbook-jitsi.md).
   when:
-    - matrix_jitsi_auth_type == "internal"
-    - item.username == ''
-    - item.password == ''
+    - matrix_jitsi_enable_auth|bool
+    - matrix_jitsi_auth_type == 'internal'
+    - matrix_jitsi_prosody_auth_internal_accounts|length == '0'
   with_items: "{{ matrix_jitsi_prosody_auth_internal_accounts }}"