Properties: Avoid connecting to stats multiple times
Properties: Avoid connecting to stats multiple times

populate() can now be called multiple times, via the refresh_properties
signal. This moves the stats_updated call to ui_state_changed
so that it only happens once.

https://bugzilla.gnome.org/show_bug.cgi?id=688473

vbenes/gnome-boxes,vbenes/gnome-boxes