Remove duplication of 'private method' on SlevomatCodingStandard.Clas… #1233

Job	Run time
Lint (highest, 7.4, ubuntu-latest)	14s
Lint (highest, 8.0, ubuntu-latest)	17s
Lint (highest, 8.1, ubuntu-latest)	26s
Coding standards (highest, 8.3, ubuntu-latest)	31s
Static analysis (highest, 8.3, ubuntu-latest)	28s
Lint (highest, 8.2, ubuntu-latest)	20s
Lint (highest, 8.3, ubuntu-latest)	22s
Typos	4s
Tests (lowest, 7.4, ubuntu-latest)	17s
Tests (lowest, 7.4, windows-latest)	55s
Upload code coverage (highest, 8.3, ubuntu-latest)	42s
Tests (lowest, 8.0, ubuntu-latest)	17s
Tests (lowest, 8.0, windows-latest)	50s
Tests (lowest, 8.1, ubuntu-latest)	24s
Tests (lowest, 8.1, windows-latest)	1m 9s
Tests (lowest, 8.2, ubuntu-latest)	23s
Tests (lowest, 8.2, windows-latest)	58s
Tests (lowest, 8.3, ubuntu-latest)	22s
Tests (lowest, 8.3, windows-latest)	49s
Tests (highest, 7.4, ubuntu-latest)	23s
Tests (highest, 7.4, windows-latest)	58s
Tests (highest, 8.0, ubuntu-latest)	23s
Tests (highest, 8.0, windows-latest)	50s
Tests (highest, 8.1, ubuntu-latest)	18s
Tests (highest, 8.1, windows-latest)	48s
Tests (highest, 8.2, ubuntu-latest)	19s
Tests (highest, 8.2, windows-latest)	54s
Tests (highest, 8.3, ubuntu-latest)	17s
Tests (highest, 8.3, windows-latest)	57s
	15m 55s

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