test(system): remove obsolete SK common file name test

[ST-DDT]

Fixes #1885

• Check whether the system commonFileName (SK) test is still useful #1885

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SK doesn't have any mime type files, so there is no reason to have a dedicated test for the SK locale.
This PR removes the obsolete test.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.96%. Comparing base (3f3d628) to head (f016ae1).
Report is 1 commits behind head on next.

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #3206      +/-   ##
==========================================
- Coverage   99.96%   99.96%   -0.01%     
==========================================
  Files        2798     2798              
  Lines      227335   227335              
  Branches      957      958       +1     
==========================================
- Hits       227262   227260       -2     
- Misses         73       75       +2     

see 2 files with indirect coverage changes