ipn: remove unused parameter to func LoadPrefs, fix godoc subject

ipn/local.go

@@ -580,7 +580,7 @@ func (b *LocalBackend) loadStateLocked(key StateKey, prefs *Prefs, legacyPath st
 	if err != nil {
 		if errors.Is(err, ErrStateNotExist) {
 			if legacyPath != "" {
-				b.prefs, err = LoadPrefs(legacyPath, true)
+				b.prefs, err = LoadPrefs(legacyPath)
 				if err != nil {
 					b.logf("Failed to load legacy prefs: %v", err)
 					b.prefs = NewPrefs()

ipn/prefs.go

@@ -217,10 +217,9 @@ func (p *Prefs) Clone() *Prefs {
 	return p2
 }
 
-// LoadLegacyPrefs loads a legacy relaynode config file into Prefs
-// with sensible migration defaults set. If enforceDefaults is true,
-// Prefs.RouteAll and Prefs.AllowSingleHosts are forced on.
-func LoadPrefs(filename string, enforceDefaults bool) (*Prefs, error) {
+// LoadPrefs loads a legacy relaynode config file into Prefs
+// with sensible migration defaults set.
+func LoadPrefs(filename string) (*Prefs, error) {
 	data, err := ioutil.ReadFile(filename)
 	if err != nil {
 		return nil, fmt.Errorf("loading prefs from %q: %v", filename, err)