Fix detection of Object type in AnnotationOverlayImpl#annotation

[manovotn]

Fixes #497

@Ladicek I did not yet figure out how to write a test for this in just Jandex (I have original reproducer in Quarkus), hints are welcome :)

[Ladicek]

Thanks! Testing should be fairly simple, just create an index with Object (Index.of(Object.class)), an annotation overlay on top of it, and attempt to get annotations.

[Ladicek]

Also, the same issue occurs in other methods. Could you please fix them too?

[manovotn]

Sure, I'll get back to it tomorrow

[manovotn]

I've pushed a change to other methods having similar issue and created a test using custom IndexView.
@Ladicek please re-review when you get the chance :)

[Ladicek]

Thanks!