Remove obsolete fix in test helper #117

Job	Run time
windows (5.1, luajit, luajit)	3m 4s
windows (5.4, lua, lua)	3m 9s
windows (5.3, lua53, lua5.3)	2m 59s
unix (5.3, macos-latest)	2m 33s
unix (5.2, ubuntu-latest)	1m 4s
unix (5.2, macos-latest)	1m 46s
unix (luajit-openresty, macos-latest)	2m 26s
unix (5.1, ubuntu-latest)	57s
unix (5.4, ubuntu-latest)	49s
unix (5.3, ubuntu-latest)	1m 5s
unix (luajit-openresty, ubuntu-latest)	58s
unix (5.4, macos-latest)	2m 59s
unix (5.1, macos-latest)	2m 42s
	26m 31s

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