multi: add bool param to channel enable/disable methods

Add a new boolean parameter without changing any existing
functionality. The parameter will be used to indicate
whether a request to update a channel's status was made
manually by a user (currently always false).

server.go

@@ -965,7 +965,9 @@ func newServer(cfg *Config, listenAddrs []net.Addr,
 				return ErrServerShuttingDown
 			}
 		},
-		DisableChannel:                s.chanStatusMgr.RequestDisable,
+		DisableChannel: func(chanPoint wire.OutPoint) error {
+			return s.chanStatusMgr.RequestDisable(chanPoint, false)
+		},
 		Sweeper:                       s.sweeper,
 		Registry:                      s.invoices,
 		NotifyClosedChannel:           s.channelNotifier.NotifyClosedChannelEvent,