revert the changes to create a default category if a user does not ha… #204

Job	Run time
test (8.1, MOODLE_401_STABLE, pgsql, false)	3m 59s
test (8.1, MOODLE_401_STABLE, mariadb, false)	3m 56s
test (8.1, MOODLE_402_STABLE, pgsql, false)	3m 7s
test (8.1, MOODLE_402_STABLE, mariadb, false)	3m 11s
test (8.1, MOODLE_403_STABLE, pgsql, false)	3m 32s
test (8.1, MOODLE_403_STABLE, mariadb, false)	3m 38s
test (8.2, MOODLE_402_STABLE, pgsql, false)	3m 10s
test (8.2, MOODLE_402_STABLE, mariadb, false)	3m 17s
test (8.2, MOODLE_403_STABLE, pgsql, false)	3m 54s
test (8.2, MOODLE_403_STABLE, mariadb, false)	3m 52s
	35m 36s

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