API Update code to reflect changes in silverstripe/admin #1001

Job	Run time
CI / Generate matrix	49s
CI / Context	1s
CI / Check governance	0s
CI / 8.3 prf-low mariadb phpunit all	2m 39s
CI / 8.3 mysql80 phpunit all	2m 58s
CI / 8.3 mysql80 phplinting	1m 33s
CI / 8.3 mysql80 endtoend root job1	9m 2s
CI / 8.3 mysql80 endtoend root job2	8m 38s
CI / 8.3 mysql80 endtoend root job3	7m 19s
CI / 8.3 mysql80 js	4m 6s
CI / Dispatch tag patch release	0s
	37m 5s

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