Fix use statement order

Author: jmikola

tests/Ticket/GH2783Test.php

@@ -4,10 +4,10 @@
 
 namespace MongoDB\Laravel\Tests\Ticket;
 
+use Illuminate\Database\Eloquent\Relations\MorphOne;
 use MongoDB\Laravel\Eloquent\Model;
 use MongoDB\Laravel\Relations\MorphTo;
 use MongoDB\Laravel\Tests\TestCase;
-use Illuminate\Database\Eloquent\Relations\MorphOne;
 
 /**
  * @see https://github.com/mongodb/laravel-mongodb/issues/2783