fix: restore custom color correctly in VectorColorClassification legend

[JinIgarashi]

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Description

closes #2233

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

Changesets

• If your PR makes a change under packages folder that should be noted in one or more packages' changelogs, generate a changeset by running pnpm changeset and following the prompts. Changesets that add features should be minor and those that fix bugs should be patch. Please prefix changeset messages with feat:, fix:, or chore:.

Refer to CONTRIBUTING.MD for more information.

┆Issue is synchronized with this Wrike task by Unito

[changeset-bot]

🦋 Changeset detected

Latest commit: 6048bb9

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
geohub	Patch

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