fix: Initial sizes not calculating by ratio

[b-zurg]

If you pass in an initialSizes ratio initially (e.g. [1,2,1]) then the panels should, by default, make the two panels on the side of the middle one half of the size of the middle one.

This is currently not happening.

[github-actions]

🎉 This issue has been resolved in version 1.3.2 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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