Updated nonnegative_int tests to use _n literals

[khoang05]

…nsertions(+), 60

deletions(-)
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[elliottslaughter]

This is a good start, thanks!

There's an opportunity here to rewrite this, given that we can now do all of this inline (and this is what the positive_int test does):

Suggested change

	SUBCASE("LHS: nonnegative_int, RHS: nonnegative_int, equal") {
	CHECK(nn_int_1a == nn_int_1b);
	}
	CHECK(1_n == 1_n);

And so on. It's a bit tedious but I think the tests will read a lot cleaner after this.