Fix improper use of monitorStart

Some uses of monitorStart didn't pass the monitor parameters to the
function call. This caused runtime configuration of monitors to not have
any parameters as they never got their parameters.

server/modules/routing/maxinfo/maxinfo_exec.c

@@ -661,7 +661,7 @@ void exec_restart_monitor(DCB *dcb, MAXINFO_TREE *tree)
         MONITOR* monitor = monitor_find(tree->value);
         if (monitor)
         {
-            monitorStart(monitor, NULL);
+            monitorStart(monitor, monitor->parameters);
             maxinfo_send_ok(dcb);
         }
         else