fix(a11y): Adjust Button and FormTextInput to prevent layout issues when text size is increased in settings

[OtavioStasiak]

Proposed changes

When the text size is increased in settings (Android and iOS), the layout of the Button and FormTextInput breaks, cutting off the text in the input or not displaying the full button title. This issue occurred because the components had a fixed height. This PR replaces the fixed height with padding to resolve the problem.

Issue(s)

https://rocketchat.atlassian.net/browse/MA-168

How to test or reproduce

Screenshots

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves a current function)
• New feature (non-breaking change which adds functionality)
• Documentation update (if none of the other choices apply)

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works (if applicable)
• I have added necessary documentation (if applicable)
• Any dependent changes have been merged and published in downstream modules

Further comments