Power Machines can connect to powernets on all turfs

Created by: clusterfack

Fixes #4119 (closed), while connect_to_network was just checking to see if a powermachine was on a turf, get_cable_node was also doubly making sure it was on a simulated floor. Making it impossible to allow power machines to work while on catwalk.

Fun fact, this MAY fix solar trackers. Because while solars are currently placed on a regular simulated turfs, solar trackers were built upon catwalks. After dylan made catwalks into a nonturf they were no longer connecting to any powernets and doing literally nothing anymore.