tests: fix up typelib include paths

The js modules have so many imports back and forth that it's pretty
much guaranteed that if you import even one of them, you'll end up
importing all of them, including ui.status.bluetooth and
ui.status.network. So fix up the typelib include paths the same way
gnome-shell-jhbuild does, so we can find everything.

https://bugzilla.gnome.org/show_bug.cgi?id=650298