fix: input: fixes rectangle shape for theme 2 input and textarea

[dkilgore-eightfold]

SUMMARY:

This changes to make pill the default shape regressed the default rectangle shape in css. This change reverts the regression and updates the radius to map to theme 2.

JIRA TASK (Eightfold Employees Only):

ENG-26634

CHANGE TYPE:

• Bugfix Pull Request
• Feature Pull Request

TEST COVERAGE:

• Tests for this change already exist
• I have added unittests for this change

TEST PLAN:

Pull the pr branch and run yarn, then yarn storybook, then verify the change in Input stories - or use CodeSandbox CI and implement a TextInput and TextArea with shape={TextInputShape.Rectangle}

[codesandbox-ci]

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[codecov-commenter]

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