Correct capitalization of ErrorCodes class name.

Fixes #700

modules/core/www/loginuserpassorg.php

@@ -81,7 +81,7 @@ $t->data['rememberMeEnabled'] = false;
 $t->data['rememberMeChecked'] = false;
 if (isset($_COOKIE[$source->getAuthId() . '-username'])) $t->data['rememberUsernameChecked'] = TRUE;
 $t->data['errorcode'] = $errorCode;
-$t->data['errorcodes'] = SimpleSAML\Error\Errorcodes::getAllErrorCodeMessages();
+$t->data['errorcodes'] = SimpleSAML\Error\ErrorCodes::getAllErrorCodeMessages();
 $t->data['errorparams'] = $errorParams;
 
 if ($organizations !== NULL) {