I'm no spy, but that doesn't look anything like a bugging device. It looks like a large transformer (what kind of bug needs a 20-60W transformer??) and a crappy wiring job. It looks like maybe wiring for lights for a vanity mirror in the bathroom. I think the bottom of the image is a mirror reflecting a roll of toilet paper.
I would think that a bugging device would be much more discreet. :) That was a pretty ugly job. Must be something more to it.
The more relevant question is why bug the bathroom?