Updated FeGroupsRepository.php to swap double-quotes with single quotes

Author: dacostafilipe

Classes/Domain/Repository/FeGroupsRepository.php

@@ -87,7 +87,7 @@ protected function getAllGroupsWithIpConfiguration(): array
         return (array)$queryBuilder
             ->select('*')
             ->from(self::TABLE_NAME)
-            ->where('ip_mask != ""')
+            ->where('ip_mask != \'\'')
             ->executeQuery()
             ->fetchAllAssociative();
     }