fixed #3d-tasks/18679: Invoke toLowerCase of undefined. Enum should be used instead of ccenum to generate reverse key.

[dumganhar]

Re: https://github.com/cocos/3d-tasks/issues/18679

Changelog

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Continuous Integration

This pull request:

• needs automatic test cases check.

  Manual trigger with @cocos-robot run test cases afterward.

• does not change any runtime related code or build configuration

  If any reviewer thinks the CI checks are needed, please uncheck this option, then close and reopen the issue.

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Compatibility Check

This pull request:

• changes public API, and have ensured backward compatibility with deprecated features.
• affects platform compatibility, e.g. system version, browser version, platform sdk version, platform toolchain, language version, hardware compatibility etc.
• affects file structure of the build package or build configuration which requires user project upgrade.
• introduces breaking changes, please list all changes, affected features and the scope of violation.

[github-actions]

⚠️ Package size ⤴ 4 bytes, old: 5440955, new: 5440959

Interface Check Report

This pull request does not change any public interfaces !