refactor: replace built-in with `fmod` in `math/base/assert/is-prime`

[gunjjoshi]

Description

What is the purpose of this pull request?

This pull request:

• Completes the TODO to replace inbuilt fmod with stdlib_base_fmod, in math/base/assert/is-prime.

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• [x] Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[stdlib-bot]

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[Planeshifter]

/stdlib merge