ENH Remove duplicate calls to form field validate #825

Job	Run time
CI / Context	1s
CI / Generate matrix	19s
CI / 8.3 prf-low mariadb phpunit all	3m 40s
CI / Check governance	0s
CI / 8.3 mysql80 phpunit all	4m 15s
CI / 8.4 mysql84 phpunit all	4m 24s
CI / 8.3 mysql80 phplinting	1m 43s
CI / 8.3 mysql80 endtoend root	5m 7s
CI / 8.4 mysql84 endtoend root	5m 17s
CI / 8.3 mysql80 js	3m 50s
CI / 8.3 mysql80 doclinting	2m 38s
CI / Dispatch tag patch release	0s
	31m 14s

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