Fix mv2 permissions

[grahamlangford]

What does this PR do?

• Removes the invalid offscreen permission from mv2 manifests
• Ensures the offscreen permission is still added to mv3 manifests

Checklist

• Add jest or playwright tests and/or storybook stories
• Designate a primary reviewer @mnholtz

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.49%. Comparing base (06960f0) to head (afd972a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8379      +/-   ##
==========================================
+ Coverage   73.46%   73.49%   +0.02%     
==========================================
  Files        1333     1333              
  Lines       41238    41238              
  Branches     7678     7678              
==========================================
+ Hits        30297    30306       +9     
+ Misses      10941    10932       -9     

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[github-actions]

Playwright test results - MV2

 34 passed
 8 skipped

Details

 Open report ↗︎
 42 tests across 16 suites
 7 minutes, 43 seconds
 afd972a

Skipped tests

chrome › tests/extensionConsoleActivation.spec.ts › can activate a mod with built-in integration
edge › tests/extensionConsoleActivation.spec.ts › can activate a mod with built-in integration
chrome › tests/runtime/sidebarController.spec.ts › sidebar controller › shows focus dialog in top-level frame
edge › tests/runtime/sidebarController.spec.ts › sidebar controller › shows focus dialog in top-level frame
chrome › tests/runtime/sidebarNavigation.spec.ts › sidebar mod panels are persistent during navigation
chrome › tests/runtime/sidebarNavigation.spec.ts › sidebar form and temporary panels are unavailable after navigation
edge › tests/runtime/sidebarNavigation.spec.ts › sidebar mod panels are persistent during navigation
edge › tests/runtime/sidebarNavigation.spec.ts › sidebar form and temporary panels are unavailable after navigation

[github-actions]

Playwright test results - MV3

 42 passed

Details

 Open report ↗︎
 42 tests across 16 suites
 11 minutes, 7 seconds
 afd972a

[mnholtz]

Thanks for catching this @grahamlangford