rtpproxy: allow flags parameter to rtpproxy_destroy()

- it is optional parameter, but was not allowed by c code
- reported by Juha Heinanen

modules/rtpproxy/rtpproxy.c

@@ -360,6 +360,12 @@ static cmd_export_t cmds[] = {
 	{"rtpproxy_destroy",   (cmd_function)unforce_rtp_proxy_f,    0,
 		0, 0,
 		ANY_ROUTE},
+	{"unforce_rtp_proxy",  (cmd_function)unforce_rtp_proxy_f,    1,
+		0, 0,
+		ANY_ROUTE},
+	{"rtpproxy_destroy",   (cmd_function)unforce_rtp_proxy_f,    1,
+		0, 0,
+		ANY_ROUTE},
 	{"start_recording",    (cmd_function)start_recording_f,      0,
 		0, 0,
 		ANY_ROUTE },