Remove OIDC dependency require statement

Remove redundant require_once statement because Composer's autoload file
will be loaded in config/ProjectConfiguration.class.php and take care of
loading the OIDC dependency automatically.

plugins/arOidcPlugin/lib/arOidc.class.php

@@ -19,8 +19,6 @@
  * along with Access to Memory (AtoM).  If not, see <http://www.gnu.org/licenses/>.
  */
 
-require_once sfConfig::get('sf_root_dir').'/vendor/composer/jumbojett/openid-connect-php/src/OpenIDConnectClient.php';
-
 class arOidc
 {
     protected static $oidcIsInitialized = false;