gtkplacesview: use location instead of the enclosing one

gtkplacesview: use location instead of the enclosing one

We were using the enclosing location when connecting to a server, so
for instance if  we were connecting to ftp://test/test it would actually
open ftp://test/ instead of the full path.

To fix it, use the full location when emitting the open location signal.

https://bugzilla.gnome.org/show_bug.cgi?id=756659