General Stores Routes Fix

Description

Fixes the node in the General Stores module near the stairs so that large alien terrorists do not spawn partially inside the dirt. Specifically, it disallows aliens from showing up in the module and changes the node so that only small X-COM units show up there. It also moves the node closer to the stairs and away from the door. Simply extract into your main game folder and the route should be fixed, answer "yes to all" if prompted to overwrite anything.