API Update code to reflect changes in silverstripe/admin #489

Job	Run time
CI / Generate matrix	11s
CI / Context	1s
CI / Check governance	1s
CI / 8.3 prf-low mariadb phpunit all	7m 33s
CI / 8.3 mysql80 phpunit all	3m 8s
CI / 8.3 mysql80 phplinting	1m 50s
CI / 8.3 mysql80 endtoend root job1	8m 44s
CI / 8.3 mysql80 endtoend root job2	8m 45s
CI / 8.3 mysql80 endtoend root job3	7m 13s
CI / 8.3 mysql80 js	5m 13s
CI / Dispatch tag patch release	0s
	42m 39s

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