object: use g_signal_connect_closure_by_id
object: use g_signal_connect_closure_by_id

We parse the signal name few lines earlier, we might just as well use
the parsed id.

https://bugzilla.gnome.org/show_bug.cgi?id=690688

mtwebster/cjs,djdeath/gjs,djdeath/gjs,pixunil/cjs,mtwebster/cjs,mtwebster/cjs,endlessm/gjs,endlessm/gjs,endlessm/gjs,mtwebster/cjs,endlessm/gjs,endlessm/gjs,pixunil/cjs,djdeath/gjs,djdeath/gjs,pixunil/cjs,pixunil/cjs,djdeath/gjs,mtwebster/cjs,pixunil/cjs