cmd/horsebot: use purple circles for negative skills in related menu

cmd/horsebot/skill.go

@@ -208,14 +208,14 @@ func (s *skillServer) render(id horse.SkillID) discord.ContainerComponent {
 		for _, rs := range rel {
 			name := rs.Name
 			emoji := "⚪"
-			switch rs.Rarity {
-			case 1:
-				if rs.UniqueOwner != "" {
-					name += " (Inherited)"
-				}
-			case 2:
+			switch {
+			case rs.Rarity == 3, rs.Rarity == 4, rs.Rarity == 5:
+				emoji = "🟠"
+			case rs.UniqueOwner != "":
+				name += " (Inherited)"
+			case rs.Rarity == 2:
 				emoji = "🟡"
-			case 3, 4, 5:
+			case rs.GroupRate == -1:
 				emoji = "🟣"
 			default:
 				emoji = "⁉️"