peer+funding: remove unneeded channel handoff code with the breach arbiter

We no longer need to hand off new channels that come online as the
chainWatcher will be persistent, and always have an active signal for
the entire lifetime of the channel.

peer.go

@@ -312,14 +312,6 @@ func (p *peer) loadActiveChannels(chans []*channeldb.OpenChannel) error {
 
 		peerLog.Infof("peerID(%v) loading ChannelPoint(%v)", p.id, chanPoint)
 
-		select {
-		case p.server.breachArbiter.newContracts <- lnChan:
-		case <-p.server.quit:
-			return fmt.Errorf("server shutting down")
-		case <-p.quit:
-			return fmt.Errorf("peer shutting down")
-		}
-
 		// Skip adding any permanently irreconcilable channels to the
 		// htlcswitch.
 		if dbChan.IsBorked {
@@ -1220,18 +1212,6 @@ out:
 				p.activeChanMtx.Unlock()
 				close(newChanReq.done)
 				newChanReq.channel.Stop()
-				newChanReq.channel.CancelObserver()
-
-				// We'll re-send our current channel to the
-				// breachArbiter to ensure that it has the most
-				// up to date version.
-				select {
-				case p.server.breachArbiter.newContracts <- currentChan:
-				case <-p.server.quit:
-					return
-				case <-p.quit:
-					return
-				}
 
 				// If we're being sent a new channel, and our
 				// existing channel doesn't have the next