Fix divide zero issue in mat4.toSRT which causes node._lrot with NaN values.

[dumganhar]

Re: #16929

If node._lrot.x is NaN, it will be serialized to scene data with null value.

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

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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[bot]]

Interface Check Report

This pull request does not change any public interfaces !