fix upgrade.php #261

Job	Run time
test (8.1, MOODLE_401_STABLE, pgsql, false)	4m 3s
test (8.1, MOODLE_401_STABLE, mariadb, false)	3m 44s
test (8.1, MOODLE_402_STABLE, pgsql, false)	3m 16s
test (8.1, MOODLE_402_STABLE, mariadb, false)	3m 33s
test (8.1, MOODLE_403_STABLE, pgsql, false)	3m 45s
test (8.1, MOODLE_403_STABLE, mariadb, false)	3m 39s
test (8.1, MOODLE_404_STABLE, pgsql, false)	3m 45s
test (8.1, MOODLE_404_STABLE, mariadb, false)	3m 56s
test (8.2, MOODLE_402_STABLE, pgsql, false)	3m 17s
test (8.2, MOODLE_402_STABLE, mariadb, false)	3m 19s
test (8.2, MOODLE_403_STABLE, pgsql, false)	3m 40s
test (8.2, MOODLE_403_STABLE, mariadb, false)	3m 52s
test (8.2, MOODLE_404_STABLE, pgsql, false)	4m 3s
test (8.2, MOODLE_404_STABLE, mariadb, false)	3m 51s
test (8.3, MOODLE_404_STABLE, pgsql, false)	3m 51s
test (8.3, MOODLE_404_STABLE, mariadb, false)	3m 48s
test (8.3, main, mariadb, true)	4m 5s
	1h 3m 27s

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