fix upgrade.php (#30) #263

Job	Run time
test (8.1, MOODLE_401_STABLE, pgsql, false)	4m 5s
test (8.1, MOODLE_401_STABLE, mariadb, false)	3m 44s
test (8.1, MOODLE_402_STABLE, pgsql, false)	3m 26s
test (8.1, MOODLE_402_STABLE, mariadb, false)	3m 19s
test (8.1, MOODLE_403_STABLE, pgsql, false)	3m 57s
test (8.1, MOODLE_403_STABLE, mariadb, false)	3m 53s
test (8.1, MOODLE_404_STABLE, pgsql, false)	3m 58s
test (8.1, MOODLE_404_STABLE, mariadb, false)	4m 2s
test (8.2, MOODLE_402_STABLE, pgsql, false)	3m 11s
test (8.2, MOODLE_402_STABLE, mariadb, false)	3m 12s
test (8.2, MOODLE_403_STABLE, pgsql, false)	3m 52s
test (8.2, MOODLE_403_STABLE, mariadb, false)	3m 50s
test (8.2, MOODLE_404_STABLE, pgsql, false)	4m 1s
test (8.2, MOODLE_404_STABLE, mariadb, false)	3m 56s
test (8.3, MOODLE_404_STABLE, pgsql, false)	4m 11s
test (8.3, MOODLE_404_STABLE, mariadb, false)	3m 58s
test (8.3, main, mariadb, true)	4m 14s
	1h 4m 49s

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