fix addon of blas/ext/base/dcusumors

[itskdhere]

Description

What is the purpose of this pull request?

This pull request:

• fixes the data type of sum from int64 to double in src/addon.c of blas/ext/base/dcusumors

Related Issues

Does this pull request have any related issues?

This pull request:

• fixes refactor blas/ext/base/dcusumors to follow current project conventions #2041

Questions

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No.

Other

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https://github.com/stdlib-js/stdlib/pull/2041/files#diff-b5fcd80892477ade520b4d9b66e72c4a414a3a4e6acb1e05c9d91d15a4a3fcacL111

Checklist

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• Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[Planeshifter]

Thanks for the fix!