mailer: fix error handling

previous mailer code has no callback and thus no way to pass back errors.
now with asyncification it passes back the error

src/routes/cloudron.js

@@ -63,7 +63,7 @@ async function login(req, res, next) {
 
     eventlog.add(eventlog.ACTION_USER_LOGIN, auditSource, { userId: req.user.id, user: users.removePrivateFields(req.user) });
 
-    await safe(users.notifyLoginLocation(req.user, ip, userAgent, auditSource));
+    safe(users.notifyLoginLocation(req.user, ip, userAgent, auditSource));
 
     next(new HttpSuccess(200, token));
 }