multi: rename experimental endorsement signal to accountable

Renames the endorsement signal to accountable to
match the latest proposal https://github.com/lightning/blips/pull/67

lncfg/protocol_integration.go

@@ -74,8 +74,8 @@ type ProtocolOptions struct {
 	// NoRouteBlindingOption disables forwarding of payments in blinded routes.
 	NoRouteBlindingOption bool `long:"no-route-blinding" description:"do not forward payments that are a part of a blinded route"`
 
-	// NoExperimentalEndorsementOption disables experimental endorsement.
-	NoExperimentalEndorsementOption bool `long:"no-experimental-endorsement" description:"do not forward experimental endorsement signals"`
+	// NoExperimentalAccountabilityOption disables experimental accountability.
+	NoExperimentalAccountabilityOption bool `long:"no-experimental-accountability" description:"do not forward experimental accountability signals"`
 
 	// NoQuiescenceOption disables quiescence for all channels.
 	NoQuiescenceOption bool `long:"no-quiescence" description:"do not allow or advertise quiescence for any channel"`
@@ -137,10 +137,10 @@ func (l *ProtocolOptions) NoRouteBlinding() bool {
 	return l.NoRouteBlindingOption
 }
 
-// NoExperimentalEndorsement returns true if experimental endorsement should
-// be disabled.
-func (l *ProtocolOptions) NoExperimentalEndorsement() bool {
-	return l.NoExperimentalEndorsementOption
+// NoExpAccountability returns true if experimental accountability should be
+// disabled.
+func (l *ProtocolOptions) NoExpAccountability() bool {
+	return l.NoExperimentalAccountabilityOption
 }
 
 // NoQuiescence returns true if quiescence is disabled.