[11.x] Fix make:listener command (#52924)

* [11.x] Fix make:listener command * Update ListenerMakeCommand.php

Author: iamgergo

src/Illuminate/Foundation/Console/ListenerMakeCommand.php

@@ -104,7 +104,7 @@ protected function getStub()
  */
  protected function alreadyExists($rawName)
  {
- return class_exists($rawName);
+ return class_exists($this->qualifyClass($rawName));
  }
 
  /**