Removed trailing space in "Color randomizer "

[im3dabasia]

What?

In continuation of issue #59821, this comment by @ramonjd requested opening a PR to remove the trailing space in the "Color randomizer" string in lib/experiments-page.php.

Why?

The issue was re-opened to address it as it was not completely resolved; the string 'Color randomizer ' still contained a trailing space.

How?

Based on the suggestion, I have removed the trailing space from the string and am now raising a PR to address this.

[github-actions]

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Co-authored-by: im3dabasia <[email protected]>
Co-authored-by: ramonjd <[email protected]>

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[github-actions]

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[ramonjd]

LGTM

Thank you for the follow up!