fix: scene culling light造成UBO无法对齐

[Magnetismmy]

Re: #

Changelog

scene culling light造成UBO无法对齐，疑似C++原生端有相同问题未修改
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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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Code Size Check Report

Wechat (WASM)	Before	After	Diff
2D Empty (legacy pipeline)	1009738 bytes	1009738 bytes	✅ 0 bytes
2D All (legacy pipeline)	2675347 bytes	2675347 bytes	✅ 0 bytes
2D All (new pipeline)	2767083 bytes	2767091 bytes	⚠️ +8 bytes
(2D + 3D) All	10024081 bytes	10024089 bytes	⚠️ +8 bytes

Web (WASM + ASMJS)	Before	After	Diff
(2D + 3D) All	16843143 bytes	16843151 bytes	⚠️ +8 bytes

Interface Check Report

This pull request does not change any public interfaces !