API Update code to reflect changes in silverstripe/admin #957

Job	Run time
CI / Context	1s
CI / Generate matrix	26s
CI / Check governance	0s
CI / 8.3 prf-low mariadb phpunit all	2m 35s
CI / 8.3 mysql80 phpunit all	3m 18s
CI / 8.3 mysql80 phplinting	1m 42s
CI / 8.3 mysql80 endtoend root job1	32m 58s
CI / 8.3 mysql80 endtoend root job2	22m 8s
CI / 8.3 mysql80 endtoend root job3	15m 36s
CI / 8.3 mysql80 js	3m 51s
CI / Dispatch tag patch release	0s
	1h 22m 35s

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