fix: bring duplicated layer to the top

[JinIgarashi]

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Description

fixes #4931

fix: previously, the order of layers in sidebar is opposite from what maplibre renders. That makes some confusion and users do not realize the first layer is actually rendered the bottom of second layer. This will bring duplicated layer to the top, so it will be the same order of maplibre.

• previously, when duplicate layer, new layer is added to the bottom.

when users changed parameters in the first layer, it looks not being changed because it is behind the second layer. But the first layer is actually changed when the second layer is hidden.

This makes users confused because the order of layers maplibre renders is opposite.

• now, new layer is added to the top

Now the order of layers in sidebar and the order of maplibre rendered layers are the same. I believe this can solve the confusion for users at least.

Type of Pull Request

• Adding a feature
• Fixing a bug
• Maintaining documents
• Adding tests
• Others ()

Verify the followings

• Code is up-to-date with the develop branch
• No build errors after pnpm build
• No lint errors after pnpm lint
• Run the tests with pnpm test and lint the project with pnpm lint and pnpm check
• Make sure all the existing features working well

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Latest commit: f90f34a

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