when use MockWith annotation, mockClass not right

```
TestableClassTransformer#lookForMockWithAnnotationAsSourceClass
->
TestableClassTransformer#parseMockWithAnnotation
...
if (isExpectedType(cn.name, type, expectedType)) {
Type clazz = AnnotationUtil.getAnnotationParameter(an, ConstPool.FIELD_VALUE,
Type.getType(NullType.class), Type.class);
DiagnoseUtil.setupByClass(ClassUtil.getClassNode(clazz.getClassName()));
return clazz.getClassName();
}
...
```
clazz.getClassName() should be converted to vm className

Start in TestableClassTransformer#lookForMockWithAnnotationAsSourceClass and follow into #parseMockWithAnnotation, focusing on the shown clazz.getClassName() path and how VM class names are represented. Done means the mockClass value is converted to the VM className before DiagnoseUtil.setupByClass and the returned value use it consistently.

Written by the indexing model from the issue text.