Fix validation task

roles/matrix-bridge-mautrix-whatsapp/tasks/validate_config.yml

@@ -17,4 +17,4 @@
       Please change your configuration to rename the variable (`{{ item.old }}` -> `{{ item.new }}`).
   when: "item.old in vars"
   with_items:
-    - {'old': 'matrix_mautrix_whatsapp_log_level', 'new': '<superseded by matrix_mautrix_whatsapp_logging_level>'}
+    - {'old': 'matrix_mautrix_whatsapp_log_level', 'new': 'matrix_mautrix_whatsapp_logging_level'}