fix: parent elements could not be scrolled when cursor above the grid

[jajugoguma]

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• [x] It's submitted to right branch according to our branching model
• [x] It's right issue type on title
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Description

• Fixed an issue where parent elements could not be scrolled when the cursor was above the grid.
  • This was caused by calling preventDefault regardless of whether the grid was scrollable or not.

As-Is

To-Be

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Thank you for your contribution to TOAST UI product. 🎉 😘 ✨

[fix-a-lot]

안그래도 이것 때문에 버전 내렸었는데 🤣