invalidJavadocTags does not consider default access modifiers

`invalidJavadocTags` can be configured to only examine methods with certain access modifiers (`invalidJavadocTagsVisibility`). However this seems to only consider explicitly specified modifiers and not effective/default modifiers.

E.g. when `invalidJavadocTagsVisibility` is set to `protected` it should validate all methods in an interface since they are all implicitly `public`. However, a warning is only created when the method is explicitly marked as `public`:

```java
public interface MyInterface
{
// creates a warning
/**
* @param doesNotExist
*/
public void test1();

// does not create a warning
/**
* @param doesNotExist
*/
void test2();
}
```