Fix internal string binding representation

internal/action/bufpane.go

@@ -62,6 +62,8 @@ func LuaAction(fn string) func(*BufPane) bool {
 
 // BufMapKey maps an event to an action
 func BufMapEvent(k Event, action string) {
+	config.Bindings["buffer"][k.Name()] = action
+
 	switch e := k.(type) {
 	case KeyEvent, KeySequenceEvent, RawEvent:
 		bufMapKey(e, action)