Fixed system events handler

[Limraj]

Description
Handlers for system events are not executed.

To Reproduce

1. Login as admin;
2. Go to 'Events handlers';
3. Click on: Event types->System events->User login:
   
4. Click on 'Add user' for admin user:
   
5. Click on 'save' and result:
   
6. Logout and login as admin;
7. In file log tomcat/logs/catalina.out not logged send email -> error;
8. Or after configure in system settings:
   
   and FakeSMTP program (port 25, and click 'Server started'):
   
   then emails not sending to inbox -> error

Links
FakeSMTP - for test, run program from console/terminal:
java -jar fakeSMTP-2.0.jar

Spec:

• Scada version: 2.6.12