Escape Shuttle Fix

-Escape shuttle will now properly delete grilles/windows when it arrives

I used supplyshuttle.dm as a reference to make this fix, ideally it should solve the problem.
This must be indented at the same level as the ```else if``` (they're part of the if statement, it won't compile since the compiler reads the indentation advance as a new block under the if, and since the if line has unbalanced parens it states "missing paren".