[5.0] Fix event:scan command

Fixes error with the event:scan command. Changes made in this https://github.com/laravel/framework/commit/21a48520e5777acb88f66f9ed5f9628b5e45d070 did not update event scanning
```
[ErrorException]
  Argument 1 passed to Illuminate\Events\Annotations\Scanner::create() must be of the type array, string given, called in /home/vagrant/Code/behat_v2_laravel/vendor/laravel/framework/src/Illuminate/Foundation/Console/EventScanCommand.php on line 47 and defined
```