Fixed BeEquivalentTo when using a custom comparer targeting nullable types

[arocheleau]

The way the EqualityComparerEquivalencyStep<T> step is comparing the comparand's type against the equality comparer's type has been reviewed to take into account nullables.

This fixes #2595.

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[github-actions]

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It seems all right 👌

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[coveralls]

Pull Request Test Coverage Report for Build 9224869081

Details

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 97.566%

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Totals
Change from base Build 9161168279:	0.0%
Covered Lines:	12055
Relevant Lines:	12239

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💛 - Coveralls

[dennisdoomen]

Thanks. In addition to the comments from @IT-VBFK, I have nothing more to add than a suggestion