fix(permissions): do not deny editing approved strings without reviews

[nijel]

Proposed changes

This might happen after disabling reviews and having approved strings. On the other side we don't want to wipe out approved states immediatelly in case user is doing some more changes (for example changing per-language workflows).

Fixes #12075

Checklist

• Lint and unit tests pass locally with my changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have added documentation to describe my feature.
• I have squashed my commits into logic units.
• I have described the changes in the commit messages.

Other information

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.58%. Comparing base (6aee586) to head (0746215).
Report is 4998 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12076      +/-   ##
==========================================
- Coverage   90.82%   90.58%   -0.24%     
==========================================
  Files         554      582      +28     
  Lines       57306    59279    +1973     
  Branches     9122     9474     +352     
==========================================
+ Hits        52046    53697    +1651     
- Misses       3640     3873     +233     
- Partials     1620     1709      +89     

Files with missing lines	Coverage Δ
weblate/auth/permissions.py	88.88% <100.00%> (-0.05%)	⬇️

... and 358 files with indirect coverage changes