Reset scope when create new bouncer instance

[comhon-project]

Hello team!

the Scope is persistent between several application initialization (typically during tests). the scope is defined as a static value in Silber\Bouncer\Database\Models and is not reset when bouncer service is initialized. Due to this, the scope is not reset between tests.

So the solution that I propose is to reset scope when create new bouncer instance

linked to issue 643