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

feature/default_sets.go

@@ -100,7 +100,7 @@ var defaultSetDesc = setDesc{
 		SetInit:    {}, // I
 		SetNodeAnn: {}, // N
 	},
-	lnwire.ExperimentalEndorsementOptional: {
+	lnwire.ExperimentalAccountabilityOptional: {
 		SetNodeAnn: {}, // N
 	},
 	lnwire.RbfCoopCloseOptionalStaging: {

feature/manager.go

@@ -69,9 +69,9 @@ type Config struct {
 	// NoTaprootOverlay unsets the taproot overlay channel feature bits.
 	NoTaprootOverlay bool
 
-	// NoExperimentalEndorsement unsets any bits that signal support for
-	// forwarding experimental endorsement.
-	NoExperimentalEndorsement bool
+	// NoExperimentalAccountability unsets any bits that signal support for
+	// forwarding experimental accountability.
+	NoExperimentalAccountability bool
 
 	// NoRbfCoopClose unsets any bits that signal support for using RBF for
 	// coop close.
@@ -213,9 +213,9 @@ func newManager(cfg Config, desc setDesc) (*Manager, error) {
 			raw.Unset(lnwire.SimpleTaprootOverlayChansOptional)
 			raw.Unset(lnwire.SimpleTaprootOverlayChansRequired)
 		}
-		if cfg.NoExperimentalEndorsement {
-			raw.Unset(lnwire.ExperimentalEndorsementOptional)
-			raw.Unset(lnwire.ExperimentalEndorsementRequired)
+		if cfg.NoExperimentalAccountability {
+			raw.Unset(lnwire.ExperimentalAccountabilityOptional)
+			raw.Unset(lnwire.ExperimentalAccountabilityRequired)
 		}
 		if cfg.NoRbfCoopClose {
 			raw.Unset(lnwire.RbfCoopCloseOptionalStaging)