Make the slider interactive again

[MGaetan89]

Pull request

Description

This PR makes the slider interactive again in ResizablePlayerShowcase and SmoothSeekingShowcase. The issue was introduced in #698, where interactionSource was made optional to follow Android's recommendation. However, these two usages were not updated to provide a non-null argument.

Fixes #722

Changes made

• Self-explanatory.

Checklist

• [x] Your branch has been rebased onto the main branch.
• [ ] APIs have been properly documented (if relevant).
• [ ] The documentation has been updated (if relevant).
• [ ] New unit tests have been written (if relevant).
• [ ] The demo has been updated (if relevant).
• [x] All pull request status checks pass.

[github-actions[bot]]

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