BUG/MINOR: http-request: fix enum for default-errorfile in return action #453

Job	Run time
HAProxy check commit message	0s
generate-models	1m 16s
generate-specification	42s
go mod tidy	16s
golangci-lint	1m 22s
Build	23s
lint-spec	6s
Tests	35s
e2e on HAProxy (2.1)	40s
e2e on HAProxy (2.2)	40s
e2e on HAProxy (2.3)	38s
e2e on HAProxy (2.4)	43s
e2e on HAProxy (2.5)	39s
e2e on HAProxy (2.6)	40s
e2e on HAProxy (2.7)	40s
e2e on HAProxy (2.8)	37s
	9m 57s

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