Fix bugzilla issue 24716

[thewilsonator]

checks for isNeedThisScope should check up the inheritance chain for nested classes.

E: Apparently this doesn't do what I thought it would. Will try again later.

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Bugzilla references

Auto-close	Bugzilla	Severity	Description
✓	24716	normal	Outer class in derived inner class loses its type.

Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub run digger -- build "master + dmd#16810"