fix typo in clientEngine option #1348

Job	Run time
lint	1m 25s
unit_tests (20)	2m 3s
unit_tests (24)	1m 48s
unit_tests (18)	2m 13s
unit_tests (22)	2m 2s
lint_markdown_files / lint	1m 3s
fullstack_production_suite / test	7s
integration_tests / test	7s
Coveralls coverage	6s
	10m 54s

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