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Refactored check in IGListCollectionViewLayout for more reliable coverage

Summary:
The `[context invalidateDataSourceCounts] && _minimumInvalidatedSection == NSNotFound` condition was never getting triggered in any of our tests.

I tried to simulate this condition in my testing, but it doesn't seem possible to have `_minimumInvalidatedSection` set to `NSNotFound` when execution reaches this point. This is because the only public pathway I could see to `[context invalidateLayoutWithContext:]` was via the regular `invalidateLayout` method which always sets `_minimumInvalidatedSection` to 0 before continuing.

To solve this, since the resulting logic ends up being the same in the check above, I simply collapsed this check into the one above it.

Reviewed By: fabiomassimo

Differential Revision: D50000788

fbshipit-source-id: da0bf0cb1

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