p2p: fix bug in TestPeerDisconnect (ethereum#20277)

Author: Rick

p2p/peer_test.go

@@ -152,7 +152,7 @@ func TestPeerDisconnect(t *testing.T) {
 // This test is supposed to verify that Peer can reliably handle
 // multiple causes of disconnection occurring at the same time.
 func TestPeerDisconnectRace(t *testing.T) {
-	maybe := func() bool { return rand.Intn(1) == 1 }
+	maybe := func() bool { return rand.Intn(2) == 1 }
 
 	for i := 0; i < 1000; i++ {
 		protoclose := make(chan error)