Fix authParams option not being parsed

Author: half2me

src/Auth/SocialAuthenticate.php

@@ -112,6 +112,7 @@ protected function _normalizeConfig(&$config, $alias, $parent)
 
         $defaults = [
                 'className' => null,
+                'authParams' => [],
                 'options' => [],
                 'collaborators' => [],
                 'mapFields' => [],