fix qualified name get bug

[wiyr]

Summary

resolves #656

Test Plan

python -m unittest libcst.metadata.tests.test_scope_provider.ScopeProviderTest.test_get_qualified_names_for_the_same_prefix

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[stroxler]

Thanks for the fix @wiyr!

This looks good to me, but it would be clearer if it shipped with a new unit test that would have failed on the old code. Do you have time to add that?

[stroxler]

FYI the CI failures are not related - they are due to a click/black version mismatch and I'm working on a fix

[wiyr]

added one simple unittest

[stroxler]

Awesome, thanks for the fix!