This patch enables all tests in tarantool/luajit to be run in CI, since
all issues found with them are finally resolved in scope of the commit
847b096e ('luajit: bump new version').

Follows up #6098
Follows up tarantool/tarantool-qa#120

Reviewed-by: Sergey Kaplun <skaplun@tarantool.org>
Reviewed-by: Vitaliia Ioffe <v.ioffe@tarantool.org>
Signed-off-by: Igor Munkin <imun@tarantool.org>