Passing root to isScrollbarClick

[patrick-hurley]

Hello, thanks for the recent release and for making this repo - it’s been incredibly useful.

I hope you don't mind the PR but I noticed that clicking and dragging the scrollbar still causes the active link state to stop updating correctly in some cases. I’ve created a small update to address this problem and hope it’s helpful.

Reproduction of issue being solved:

• On the 'Window' example of the demo, When clicking on link ‘9’ and then dragging the scrollbar, the active link no longer updates correctly.
• On the 'Container' example of the demo, clicking any menu item, followed by dragging the scrollbar, results in the active link not updating as expected.

Solution:

• Modified the isScrollbarClick method to accept root as a parameter and update the condition for identifying scrollbar clicks.
• Removed the isTop and isBottom checks within isScrollbarClicked

Once again, I hope you don’t mind me opening this PR, and I really appreciate all the work you’ve done in making this project public.

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