Issue #4394: increase coverage of pitest-checkstyle-api profile to 100%

[Nimfadora]

Issue #4394

pitest-checkstyle-api profile before changes

increased mutation threshold for pitest-checkstyle-api profile by 4%
current threshold: 100%
execution time: 3:31 min

one mutation left: I have no idea how to test it

[romani]

one mutation left: I have no idea how to test it

remove this line , it is useless code as buf is temporal variable.
it is sad that pitest still allow you to set 100 as threshhold , I filed an issue on pitest - hcoles/pitest#375

[codecov-io]

Codecov Report

Merging #4740 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #4740   +/-   ##
======================================
  Coverage     100%    100%           
======================================
  Files         287     287           
  Lines       15388   15388           
  Branches     3501    3501           
======================================
  Hits        15388   15388

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