Prevent interior shuttle doors from being welded/bolted

[mralexs]

This is a reoccurring issue on Goon1, people will bolt and weld the shuttle doors to the sec, eng, cockpit, and medical areas of the shuttle just to keep anyone out. This leads to people dying due to lack of medical access and sec sometimes being unable to stop antags in the main area as nobody has the tools to get the doors open. Furthermore, its way to easy to keep snipping wires to prevent someone from getting in at all. Honestly, the shuttle interior doors shouldn't be able to be welded shut or bolted closed.