fix(number-input) build and test

[TimKolberger]

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes
  /start features)

Pull request type

Fixes build and test.

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Build and test fails for NumberInput.

What is the new behavior?

• Fix mismatching onChange prop for NumberInput by reverting commit a78a91b
• Added correct a11y computation for aria-valuetext
• Update test snapshot

Does this introduce a breaking change?

• Yes
• No

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[lgtm-com]

This pull request introduces 1 alert when merging b6eccc2 into 75547b3 - view on LGTM.com

new alerts:

• 1 for Non-linear pattern

[TimKolberger]

Failing form-control test is fixed in #1972