Registering the same Event twice

[ChristopheCVB]

Describe the bug

Registering the same Event twice results in the first one being forgotten

Code Sample

OBSRemoteController.builder()
  //...
  .registerEventListener(CurrentSceneCollectionChangedEvent.class,
    currentSceneCollectionChangedEvent -> System.out.println("First"))
  .registerEventListener(CurrentSceneCollectionChangedEvent.class,
    currentSceneCollectionChangedEvent -> System.out.println("Second"))
  //...

Expected behavior

Both Events callbacks should be invoked.

Additional context

None.