Fix: missing whitespace in unix_common.yaml

[stbe]

Whitespace was missing, leading to invalid YAML for one of the FILE sources of CupsJobCacheFile

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.33%. Comparing base (be86a49) to head (27ca5c5).
⚠️ Report is 37 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #670      +/-   ##
==========================================
- Coverage   69.70%   69.33%   -0.37%     
==========================================
  Files           9        9              
  Lines         769      763       -6     
==========================================
- Hits          536      529       -7     
- Misses        233      234       +1     

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[joachimmetz]

@stbe good catch, thanks for the changes