linked_list_spec: use from_stack {foo}
linked_list_spec: use from_stack {foo}

Currently a mixture of from_stack({foo}) and from_stack {foo} are used.
For consistency, stick to from_stack {foo}

Signed-off-by: Gregory M. Turner <1f6d1f05bf03ff30afa6123e0bee2caa2da7cff0@be-evil.net>

Afforess/Factorio-Stdlib