Improve test logic

Retest the failed part of the test and call it recursively.
Remove the number of batches that are automatically divided when testing parameters.

v2rayN/ServiceLib/Handler/CoreHandler.cs

@@ -287,7 +287,7 @@ namespace ServiceLib.Handler
             catch (Exception ex)
             {
                 Logging.SaveLog(_tag, ex);
-                UpdateFunc(true, ex.Message);
+                UpdateFunc(mayNeedSudo, ex.Message);
                 return null;
             }
         }