Fix error never removed from session in SecurotyProvider
Fix error never removed from session in SecurotyProvider

When $message is different than the $error variable, the wrong session key is deleted.

romainneutron/Silex,romainneutron/Silex,mTorres/Silex,mTorres/Silex,silexphp/Silex,gencer/Silex,fabpot/Silex,romainneutron/Silex,fabpot/Silex