My initial port of this wasn't great, this is much better.
Testing Done:
sent messages between pidgin2 with gkdr/carbons, conversations on my phone, and pidgin3. I sent messages from all clients and received them on all three clients.
pidgin_status_box_add(PIDGIN_STATUS_BOX(status_box),PIDGIN_STATUS_BOX_TYPE_PRIMITIVE,NULL,_("Do not disturb"),NULL,GINT_TO_POINTER(PURPLE_STATUS_UNAVAILABLE));