Fix getComponentInstallDirectory plugintypes retrieval issue. #731

Job	Run time
CI test (make validate)	57s
Code coverage (codecov)	54s
Build moodle-plugin-ci.phar	44s
Integration tests (8.3, main, true)	6m 48s
Integration tests (8.3, MOODLE_405_STABLE, true)	6m 39s
Integration tests (8.3, MOODLE_404_STABLE, true)	6m 31s
Integration tests (8.2, MOODLE_403_STABLE, true)	6m 16s
Integration tests (8.2, MOODLE_402_STABLE, true)	6m 26s
Integration tests (8.1, MOODLE_401_STABLE, true)	7m 19s
Integration tests (8.0, MOODLE_400_STABLE)	5m 58s
Integration tests (8.0, MOODLE_311_STABLE)	5m 21s
Integration tests (7.4, MOODLE_39_STABLE)	5m 10s
SelfUpdate tests (PHAR) (8.3)	33s
SelfUpdate tests (PHAR) (8.2)	33s
Integration tests (PHAR) (8.3, main, true)	5m 53s
SelfUpdate tests (PHAR) (8.1)	27s
Integration tests (PHAR) (8.3, MOODLE_405_STABLE, true)	6m 52s
SelfUpdate tests (PHAR) (8.0)	20s
Integration tests (PHAR) (8.3, MOODLE_404_STABLE, true)	5m 59s
SelfUpdate tests (PHAR) (7.4)	9s
Integration tests (PHAR) (8.2, MOODLE_403_STABLE, true)	5m 50s
Integration tests (PHAR) (8.1, MOODLE_402_STABLE, true)	5m 30s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE, true)	6m 31s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	5m 5s
	1h 42m 45s

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