fix(watermark): fix invalid plugin configuration

[jikkai]

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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Playwright test results

 21 passed

Details

 21 tests across 10 suites
 4 minutes, 46 seconds
 8d6d444
 For more information, see full report

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Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 33.37%. Comparing base (e909093) to head (8d6d444).
Report is 2 commits behind head on dev.

Files with missing lines	Patch %	Lines
packages/watermark/src/plugin.ts	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #4389      +/-   ##
==========================================
- Coverage   33.37%   33.37%   -0.01%     
==========================================
  Files        2529     2529              
  Lines      130404   130407       +3     
  Branches    29103    29104       +1     
==========================================
  Hits        43526    43526              
- Misses      86878    86881       +3     

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