Fix hydrogen OCSP typo

From 6f80292745

roles/matrix-nginx-proxy/templates/nginx/conf.d/matrix-client-hydrogen.conf.j2

@@ -88,7 +88,7 @@ server {
 	{% if matrix_nginx_proxy_ocsp_stapling_enabled %}
 		ssl_stapling on;
 		ssl_stapling_verify on;
-		ssl_trusted_certificate {{ matrix_ssl_config_dir_path }}/live/{{ matrix_nginx_proxy_proxy_element_hostname }}/chain.pem;
+		ssl_trusted_certificate {{ matrix_ssl_config_dir_path }}/live/{{ matrix_nginx_proxy_proxy_hydrogen_hostname }}/chain.pem;
 	{% endif %}
 
 	{% if matrix_nginx_proxy_ssl_session_tickets_off %}