Fix stopvideo event for HarmonyOS-Next platform.

[qiuguohua]

Re: #

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]

Code Size Check Report

Wechat (WASM)	Before	After	Diff
2D Empty (legacy pipeline)	1006050 bytes	1006050 bytes	✅ 0 bytes
2D All (legacy pipeline)	2671273 bytes	2671273 bytes	✅ 0 bytes
2D All (new pipeline)	2760724 bytes	2760724 bytes	✅ 0 bytes
(2D + 3D) All	10017028 bytes	10017028 bytes	✅ 0 bytes

Web (WASM + ASMJS)	Before	After	Diff
(2D + 3D) All	16838649 bytes	16838649 bytes	✅ 0 bytes

Interface Check Report

This pull request does not change any public interfaces !

[qiuguohua]

@cocos-robot run test cases

[github-actions]

@qiuguohua, Please check the result of run test cases:

• Test Platform: PR-Test
• Editor Version: v3.8.7
• Task Result: PASS
• Task URL: https://cctest.cocos.org/#/reportview/PR-TEST/944a3a84-9b05-4056-a5d2-9c325ee58631/-1
• GitHub Action: https://github.com/cocos/cocos-engine/actions/runs/15722209765

Task Details

[github-actions]

@qiuguohua, Please check the result of run test cases:

• Test Platform: PR-Test
• Editor Version: v3.8.7
• Task Result: PASS
• Task URL: https://cctest.cocos.org/#/reportview/PR-TEST/c4b2eed9-d0f7-4e4f-b0d5-b26b9bf53842/-1
• GitHub Action: https://github.com/cocos/cocos-engine/actions/runs/15722209765

Task Details