Reduced hotspot size on mobile

[murad-hubib]

• Reduced hotspot size on mobile from 28px to 16px

@bradenmacdonald Please review this minor change from MCKIN-5629

[openedx-webhooks]

Thanks for the pull request, @murad-hubib! I've created OSPR-1895 to keep track of it in JIRA. JIRA is a place for product owners to prioritize feature reviews by the engineering development teams.

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[bradenmacdonald]

:+1:

• [x] I tested this: Confirmed the change in the apros LMS
• [x] I read through the code
• [ ] I checked for accessibility issues:
  • Note that this new size will be harder for people to select, especially people who may not have fine motor control. However, this XBlock is already not very accessible as the hotspots are not focusable. We should improve the accessibility in any future PRs; for now it is out of scope.
• [x] Includes documentation: n/a