Follow up to 6ec51e8

Thanks to @mazvi

conf/battle/feature.conf

@@ -116,6 +116,6 @@ feature.privateairship: on
 // Requires: 2018-07-04RagexeRE or later
 feature.barter: on
 
-// Barter Shop System (Note 1)
+// Extended Barter Shop System (Note 1)
 // Requires: 2019-11-06RagexeRE or later
-feature.barter: on
+feature.barter_extended: on