Fixing ConnInstance confidential property masking for audit events

Author: ilgrosso

core/provisioning-java/src/main/java/org/apache/syncope/core/provisioning/java/DefaultAuditManager.java

@@ -115,7 +115,7 @@ protected static Object maskSensitive(final Object object) {
 
             case ConnInstanceTO connInstanceTO -> {
                 ConnInstanceTO clone = SerializationUtils.clone(connInstanceTO);
-                maskSensitive(connInstanceTO.getConf());
+                maskSensitive(clone.getConf());
                 yield clone;
             }