Automatically enable admin api access via nginx

This was a bug preventing the bot from interacting with the admin API (404). It now configures nginx so that the admin API is accessible from the outside, as synapse admin does too

group_vars/matrix_servers

@@ -1495,7 +1495,7 @@ matrix_nginx_proxy_proxy_matrix_client_api_client_max_body_size_mb: |-
     }[matrix_homeserver_implementation]|int
   }}
 
-matrix_nginx_proxy_proxy_matrix_client_api_forwarded_location_synapse_admin_api_enabled: "{{ matrix_synapse_admin_enabled }}"
+matrix_nginx_proxy_proxy_matrix_client_api_forwarded_location_synapse_admin_api_enabled: "{{ matrix_synapse_admin_enabled }} or {{ matrix_bot_matrix_registration_bot_enabled }}"
 
 matrix_nginx_proxy_proxy_matrix_client_redirect_root_uri_to_domain: "{{ matrix_server_fqn_element if matrix_client_element_enabled else '' }}"