Buff staff of cthulu a little

[Berrik]

Currently it's easy to get around it not being pickuppable or draggable by dragging a crate or a locker over it and then closing it, which makes staff of cthulu a wasted spell slot. This is clearly an exploit and I think that attempting to do so should return the message "The staff of cthulu magically prevents the (container) from closing!" while making the container uncloseable.