API Update code to reflect changes in silverstripe/admin #974

Job	Run time
CI / Context	1s
CI / Generate matrix	19s
CI / Check governance	0s
CI / 8.3 prf-low mariadb phpunit all	3m 10s
CI / 8.3 mysql80 phpunit all	3m 23s
CI / 8.3 mysql80 phplinting	1m 53s
CI / 8.3 mysql80 endtoend root job1	33m 2s
CI / 8.3 mysql80 endtoend root job2	22m 14s
CI / 8.3 mysql80 endtoend root job3	15m 12s
CI / 8.3 mysql80 js	3m 32s
CI / Dispatch tag patch release	0s
	1h 22m 46s

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