Fix appconfig compatibility with Oracle DB

Signed-off-by: Joas Schilling <coding@schilljs.com>

lib/private/AppConfig.php

@@ -34,6 +34,7 @@ namespace OC;
 
 use OC\DB\Connection;
 use OC\DB\OracleConnection;
+use OCP\DB\QueryBuilder\IQueryBuilder;
 use OCP\IAppConfig;
 use OCP\IConfig;
 
@@ -298,7 +299,7 @@ class AppConfig implements IAppConfig {
 				$sql->andWhere(
 					$sql->expr()->orX(
 						$sql->expr()->isNull('configvalue'),
-						$sql->expr()->neq('configvalue', $sql->createNamedParameter($value))
+						$sql->expr()->neq('configvalue', $sql->createNamedParameter($value), IQueryBuilder::PARAM_STR)
 					)
 				);
 			}