Classes/RestrictedExtendClasses: minor tweak #347

Job	Run time
QTest: PHP 5.4 - PHPCS lowest	1m 16s
QTest + Lint: PHP 5.4 - PHPCS stable	1m 4s
QTest: PHP latest - PHPCS lowest	16s
QTest + Lint: PHP latest - PHPCS stable	21s
	2m 57s

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