Hotfix for negative values in peaks

[obulat]

Fixes

Related to openverse-api issue#575.

Description

The front end expects all audio peaks values to be non-negative integers in the range of [0..1]. However, some of the peaks values that API sends are negative.
This PR adjust the validator for peak values, and makes all the values at least zero.
To minimize the effect of this fix on performance, I added the Math.max(0, value) to the already existing map function that handles the peaks object.

Testing Instructions

On the main branch, go to http://localhost:8443/audio/727b9979-98f1-4604-9097-0a8b6fa68f2e/. You should see a warning in the console saying "Invalid prop: custom validator check failed for prop "peaks".
When opening the same page on this branch, you should not see this warning.

Checklist

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• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.

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[dhruvkb]

I like it. Maybe we can add a test for this but that's not too important.

[dhruvkb]

Let's not set this arbitrary limit and maybe just check for type of number.

[sarayourfriend]

LGTM! I agree with Dhruv's comment to just check for typeof number in the validator for now.