htlcswitch+lnwallet: remove PaymentDescriptor from ReceiveRevocation returns

This is part of a systematic removal of PaymentDescriptor from the public
API of the lnwallet package. This marks the last change needed before we
make the PaymentDescriptor structure private.

lnwallet/test_utils.go

@@ -566,7 +566,7 @@ func ForceStateTransition(chanA, chanB *LightningChannel) error {
 		return err
 	}
 
-	_, _, _, _, err = chanA.ReceiveRevocation(bobRevocation)
+	_, _, err = chanA.ReceiveRevocation(bobRevocation)
 	if err != nil {
 		return err
 	}
@@ -579,7 +579,7 @@ func ForceStateTransition(chanA, chanB *LightningChannel) error {
 	if err != nil {
 		return err
 	}
-	_, _, _, _, err = chanB.ReceiveRevocation(aliceRevocation)
+	_, _, err = chanB.ReceiveRevocation(aliceRevocation)
 	if err != nil {
 		return err
 	}