Fix `deck gateway apply` (#1508) #3371

Job	Run time
integration (kong:2.8)	2m 33s
integration (kong:3.4)	2m 45s
integration (kong:3.5)	2m 57s
integration (kong:3.6)	2m 46s
integration (kong:3.7)	2m 56s
integration (kong:3.8)	2m 59s
integration (kong:3.9)	2m 55s
integration (kong/kong:master)	3m 4s
	22m 55s

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