Fix `a-text-input` error/warning/success modifiers

[anselmbradford]

https://github.com/cfpb/design-system/pull/1886 erroneously set the a-text-input error/warning/success modifiers to be blocks, apparently because of a mistake I made reconciling conflicts in https://github.com/cfpb/design-system/pull/1886/commits/6f6bbbbc307f1e5dccc7e6b8f9a90fa196743294

https://github.com/cfpb/design-system/pull/1983/ updated the example to follow the CSS, but the CSS should actually be updated to retain these as modifiers instead of erroneously as blocks.

Changes

• Fix a-text-input error/warning/success modifiers

Testing

1. Text inputs should have error/warning/success colored border styling on https://deploy-preview-1984--cfpb-design-system.netlify.app/design-system/components/text-inputs

[netlify[bot]]

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