fix: adjust toolbar item position in uni-mode

[yuhongz]

close #xxx

Pull Request Checklist

• Related tickets or issues have been linked in the PR description (or missing issue).
• Naming convention is followed (do please check it especially when you created new plugins, commands and resources).
• Unit tests have been added for the changes (if applicable).
• Breaking changes have been documented (or no breaking changes introduced in this PR).

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Codecov Report

Attention: Patch coverage is 0% with 9 lines in your changes missing coverage. Please review.

Project coverage is 26.12%. Comparing base (64917c2) to head (237aea1).

Files	Patch %	Lines
...imental/uniui/src/views/uni-toolbar/UniToolbar.tsx	0.00%	8 Missing ⚠️
...al/uniui/src/views/uni-toolbar/UniFloatToolbar.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #2987      +/-   ##
==========================================
- Coverage   26.12%   26.12%   -0.01%     
==========================================
  Files        1906     1906              
  Lines      101749   101754       +5     
  Branches    21731    21731              
==========================================
  Hits        26582    26582              
- Misses      75167    75172       +5     

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