[Proposal] Removed Model::getConnectionName() override

[telkins]

This is a great package, but it overrides Model::getConnectionName(), which proves to be a problem. We already have simple traits that do something similar and we can't have both.

This solution moves the fallback call to config() (which one could argue might not be necessary) to the two instances where getConnectionName() is called.

Alternatives:

• Change getConnectionName() to getLaravelModelSettingsConnectionName(), which, in turn, calls getConnectionName() and handles the fallback.
• Don't worry about the fallback. I think that Model will eventually fall back to the default connection. (See Illuminate\Database\ConnectionResolver.)
• ...?

Let me know if you have questions/concerns, and thanks for the great work thus far. 🤓