No longer "forever in an old group" after logoff

Author: Treeku

src/services/ConnectionService.java

@@ -189,6 +189,7 @@ public void disconnect(IoSession session) {
 		object.setInviteCounter(0);
 		object.setInviteSenderId(0);
 		object.setInviteSenderName("");
+		core.groupService.handleGroupDisband(object);
 		object.setClient(null);
 		PlayerObject ghost = (PlayerObject) object.getSlottedObject("ghost");