Custom button deletion uses wrong index

When deleting custom buttons, the method to remove a button from a configuration is called based on the button's index in the RecyclerView, not based on its keyCode. This causes the button to re-appear after reloading the app. The method call causing the issue is configuration.removeCommand(position); in RemoteRecyclerAdapter.java.

Steps to reproduce:

1. Load a configuration with multiple custom buttons
2. Delete the first custom button (index 0, keyCode 0)
3. Delete the new first custom button (index 0, keyCode 1)
4. Reload the app
5. The button deleted in step 3 is loaded again. - Unexpected behaviour