fix: reset t when keyPrefix is updated.

[halouvi]

Reseting t when keyPrefix is changed
Fixes #1542

Checklist

• only relevant code is changed (make a diff before you submit the PR)
• run tests npm run test
• tests are included
• commit message and code follows the Developer's Certification of Origin

[coveralls]

Coverage remained the same at 95.862% when pulling aef6a37 on halouvi:master into ef3b87a on i18next:master.

[jamuhl]

lgtm

[halouvi]

Thanks! I really appreciate you guys working so fast 🙏

[adrai]

Thank you @halouvi for your contribution. It's included in v11.18.4

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