Remove TopLevel property from ValueMatchFilter

[manfred-brands]

As Found in #4056

This property was left behind and is only accessed in commented out code and one unit test (using reflection).

[phyrik]

I've pushed a proposed fix to this on my fork on a branch called issue/4058, would I be ok to open a PR for it?

[manfred-brands]

@phyrik Yes, go ahead and create the PR

[phyrik]

That's it made there, should be #4069