Add unique roles to authentication

Add unique roles to token so the roles keep clean!

Author: Nico Borghuis

Security/Authentication/Provider/OAuthProvider.php

@@ -95,6 +95,8 @@ public function authenticate(TokenInterface $token)
                     }
                 }
 
+                $roles = array_unique($roles);
+
                 $token = new OAuthToken($roles);
                 $token->setAuthenticated(true);
                 $token->setToken($tokenString);