fix(slider): disable thumb input when slider disabled

[fredcerdrak]

Describe your changes

Please include a summary of the change, a relevant motivation and context.

Issue ticket number and link

• Fixes regression in slider introduced with feat(slider): add section labels support #288 causing the backing input field (in thumb) not being disabled when the slider is passed the disabled prop.

Checklist before requesting a review

• I have performed a self-review of my own code
• I have verified that the code builds perfectly fine on my local system
• I have added tests that prove my fix is effective or that my feature works
• I have commented my code, particularly in hard-to-understand areas
• I have verified that my code follows the style already available in the repository
• I have made corresponding changes to the documentation

[axis-d0op]

LGTM