depreacte oidc location prefix setting

roles/matrix-nginx-proxy/tasks/validate_config.yml

@@ -14,6 +14,7 @@
     - {'old': 'matrix_nginx_proxy_proxy_riot_enabled', 'new': 'matrix_nginx_proxy_proxy_element_enabled'}
     - {'old': 'matrix_ssl_lets_encrypt_renew_cron_time_definition', 'new': '<not configurable anymore>'}
     - {'old': 'matrix_nginx_proxy_reload_cron_time_definition', 'new': '<not configurable anymore>'}
+    - {'old': 'matrix_nginx_proxy_proxy_matrix_client_api_forwarded_location_synapse_oidc_api_enabled', 'new': '<not configurable anymore>'}
 
 - name: Fail on unknown matrix_ssl_retrieval_method
   fail: