ENH Update code to reflect changes to silverstripe/admin (#205) #418

Job	Run time
CI / Context	1s
CI / Generate matrix	26s
CI / Check governance	1s
CI / 8.3 prf-low mariadb phpunit all	1m 52s
CI / 8.3 mysql80 phpunit all	2m 17s
CI / 8.4 mysql84 phpunit all	1m 55s
CI / 8.3 mysql80 phplinting	2m 8s
CI / 8.3 mysql80 endtoend root	4m 33s
CI / 8.4 mysql84 endtoend root	3m 49s
CI / 8.3 mysql80 js	3m 54s
CI / Dispatch tag patch release	1s
	20m 57s

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