Incomplete code coverage for `blas/ext/base/dnansumkbn`

[kgryte]

See https://coverage.stdlib.io/blas/ext/base/dnansumkbn/index.html.

This should be straightforward to address. Just need to add a test case in each of the test files which handles the situation where the stride is 0 and the element is NaN.

[stdlib-bot]

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