Re-add WP specific modifications for Twemoji

[desrosj]

This re-adds some WordPress specific code added to the Twemoji library that was removed when the library was updated in r61134.

Trac ticket: Core-64184

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[github-actions]

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Props desrosj.

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[ellatrix]

Looks like this correctly restores the modifications.

[github-actions]

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[desrosj]

Merged in r61180.