Use general stylelint task in grunt command. #170

Job	Run time
Code coverage (codecov)	0s
CI test (make validate)	57s
Build moodle-plugin-ci.phar	32s
Integration tests (8.3, main, true)	6m 38s
Integration tests (8.3, MOODLE_404_STABLE, true)	6m 16s
Integration tests (8.2, MOODLE_403_STABLE, true)	6m 53s
Integration tests (8.2, MOODLE_402_STABLE, true)	6m 15s
Integration tests (8.1, MOODLE_401_STABLE, true)	6m 43s
Integration tests (8.0, MOODLE_400_STABLE)	5m 36s
Integration tests (8.0, MOODLE_311_STABLE)	5m 14s
Integration tests (7.4, MOODLE_39_STABLE)	5m 4s
SelfUpdate tests (PHAR) (8.3)	33s
Integration tests (PHAR) (8.3, main, true)	6m 6s
SelfUpdate tests (PHAR) (8.2)	40s
Integration tests (PHAR) (8.3, MOODLE_404_STABLE, true)	5m 57s
SelfUpdate tests (PHAR) (8.1)	29s
Integration tests (PHAR) (8.2, MOODLE_403_STABLE, true)	5m 52s
SelfUpdate tests (PHAR) (8.0)	20s
Integration tests (PHAR) (8.1, MOODLE_402_STABLE, true)	5m 45s
SelfUpdate tests (PHAR) (7.4)	8s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE, true)	6m 20s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	5m 17s
	1h 27m 35s

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