Convert to event helper

Laravel has deprecated the `fire()` helper and `Event::fire()`.
These will be removed in Laravel 5.8. Instead, you should use
the `event()` helper.

app/Http/Controllers/Admin/helpdesk/AgentController.php

@@ -155,7 +155,7 @@ class AgentController extends Controller
             }
             // returns for the success case
             if ($request->input('active') == '0' || $request->input('active') == 0) {
-                \Event::fire(new \App\Events\LoginEvent($request));
+                event(new \App\Events\LoginEvent($request));
             }
 
             return redirect('agents')->with('success', Lang::get('lang.agent_creation_success'));