Stop exporting php-cs-fixer config

[szepeviktor]

This is a development file.

[phil-davis]

Thanks, this got missed when php-cs-fixer was bumped to a newer version and the file name changed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.68%. Comparing base (d561d08) to head (3b4036d).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #282   +/-   ##
=========================================
  Coverage     96.68%   96.68%           
  Complexity      115      115           
=========================================
  Files            13       13           
  Lines           483      483           
=========================================
  Hits            467      467           
  Misses           16       16           

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[szepeviktor]

This could be checked in a CI step.
https://github.com/szepeviktor/byte-level-care/blob/6aaffb792e2f1e5f535f7bff83a969353d1966cb/.github/workflows/reusable-integrity.yml#L186-L187