fix(worker): Handle git-annex remotes with multiple = in a value

[nellh]

Headers set in the remote are an example where this is common.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 42.97%. Comparing base (25ee4ad) to head (77f85b5).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3641      +/-   ##
==========================================
- Coverage   42.97%   42.97%   -0.01%     
==========================================
  Files         635      635              
  Lines       33808    33808              
  Branches     1515     1515              
==========================================
- Hits        14530    14529       -1     
- Misses      19139    19140       +1     
  Partials      139      139              

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