cfpb-forms: Change `o-form__input-w-btn` to `o-input-w-btn`

[anselmbradford]

o-form__input-w-btn implies this class is a modifier on o-form, however, it does not appear with o-form. This pattern was probably developed to mirror o-form__email-signup, which does appear with o-form. This PR updates the class to o-input-w-btn since it doesn't appear on a <form> element.

Changes

• Change o-form__input-w-btn to o-input-w-btn

Testing

1. PR checks should pass. https://deploy-preview-1933--cfpb-design-system.netlify.app/design-system/components/text-inputs#button-inside-text-input-with-button should be unchanged

[netlify[bot]]

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[netlify[bot]]

✅ Thanks for the improvements! Browse a preview of your changes using the link below.

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🔨 Latest commit	a48aa11bd6ebaf65d98ab9f45950006fd298d851
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[anselmbradford]

Superseded by https://github.com/cfpb/design-system/pull/1979/