fix upgrade.php (#30) #262

Job	Run time
test (8.1, MOODLE_401_STABLE, pgsql, false)	4m 29s
test (8.1, MOODLE_401_STABLE, mariadb, false)	3m 50s
test (8.1, MOODLE_402_STABLE, pgsql, false)	3m 13s
test (8.1, MOODLE_402_STABLE, mariadb, false)	3m 0s
test (8.1, MOODLE_403_STABLE, pgsql, false)	4m 2s
test (8.1, MOODLE_403_STABLE, mariadb, false)	3m 49s
test (8.1, MOODLE_404_STABLE, pgsql, false)	3m 53s
test (8.1, MOODLE_404_STABLE, mariadb, false)	3m 54s
test (8.2, MOODLE_402_STABLE, pgsql, false)	3m 15s
test (8.2, MOODLE_402_STABLE, mariadb, false)	3m 10s
test (8.2, MOODLE_403_STABLE, pgsql, false)	3m 53s
test (8.2, MOODLE_403_STABLE, mariadb, false)	3m 48s
test (8.2, MOODLE_404_STABLE, pgsql, false)	3m 45s
test (8.2, MOODLE_404_STABLE, mariadb, false)	4m 0s
test (8.3, MOODLE_404_STABLE, pgsql, false)	4m 3s
test (8.3, MOODLE_404_STABLE, mariadb, false)	3m 42s
test (8.3, main, mariadb, true)	4m 3s
	1h 3m 49s

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