fix(js): should properly update styles

[situ2001]

There is the case that when attribute is changed from style={{ anyKey: foo }} to style={undefined}, JS-side will decide not to inform Native-side for update. For further information, see #4412

Before

Screen_Recording_20250912_203942_Hippy.mp4

After

Screen_Recording_20250912_204025_Hippy.mp4

[hippy-service]

Hi, @situ2001. Thanks for your PR! 👏

🏷️ You can leave a comment in this PR with #help tag when you need help (e.g. some status checks run failed due to internal issue), admin team members will help asap.

[hippy-service]

After a quick scan, I have approved workflow to run.

• SHA: acd5c21

🏷️ New commits in this PR would not be tested automatically until this pull request is reviewed by our collaborators.
🏷️ No need to worry about the status of merge_guard and [gh] pull request merge guard / merge_guard (pull_request_target) checks, once this pull request is met merge requirements, it will be automatically converted to successful status.

[tencent-adm]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 2 committers have signed the CLA.

✅ situ2001
❌ open-hippy
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