server: exit early if not persistent peer

The point of this commit is to make future commits in the same PR easier
to review. All that this commit does is exit early if the peer we are
considering is not persistent instead of having a bunch of logic
indented in an if-clause.

server.go

@@ -3517,8 +3517,10 @@ func (s *server) peerTerminationWatcher(p *peer.Brontide, ready chan struct{}) {
 	s.removePeer(p)
 
 	// Next, check to see if this is a persistent peer or not.
-	_, ok := s.persistentPeers[pubStr]
-	if ok {
+	if _, ok := s.persistentPeers[pubStr]; !ok {
+		return
+	}
+
 	// We'll only need to re-launch a connection request if one
 	// isn't already currently pending.
 	if _, ok := s.persistentConnReqs[pubStr]; ok {
@@ -3606,7 +3608,6 @@ func (s *server) peerTerminationWatcher(p *peer.Brontide, ready chan struct{}) {
 		s.connMgr.Connect(connReq)
 	}()
 }
-}
 
 // removePeer removes the passed peer from the server's state of all active
 // peers.