fix(zip): List .wxt/local_modules overrides relative to the package.json they're added to

[aklinker1]

In a monorepo with multiple package.json files, the local modules downloaded by zip.downloadPackages should be relative to the package.json they're added to, not relative to the wxt project's root.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.64%. Comparing base (81b4b62) to head (69eb72b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #526      +/-   ##
==========================================
+ Coverage   86.59%   86.64%   +0.04%     
==========================================
  Files         111      111              
  Lines        8860     8863       +3     
  Branches      876      877       +1     
==========================================
+ Hits         7672     7679       +7     
+ Misses       1174     1170       -4     
  Partials       14       14              

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