Typehint actual Builder model (#700)

Fix for false-positive IDE errors when doing e.g. `User::whereHasPermission(...)->get()`, where the `get` method is not recognized by the IDE.

Author: janickd2g

src/Traits/HasLaratrustScopes.php

@@ -5,7 +5,7 @@
 namespace Laratrust\Traits;
 
 use BackedEnum;
-use Illuminate\Contracts\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Support\Facades\Config;
 use Laratrust\Helper;
 use Laratrust\Models\Team;