fix: ThingsboardException 的 handleException改为protected

@@ -293,7 +293,7 @@ public abstract class BaseController {
         errorResponseHandler.handle(ex, response);
         errorResponseHandler.handle(ex, response);
     }
     }
 
 
-    ThingsboardException handleException(Exception exception) {
+    protected ThingsboardException handleException(Exception exception) {
         return handleException(exception, true);
         return handleException(exception, true);
     }
     }