artists: replace /artists/banned endpoint with simple search.

app/controllers/artists_controller.rb

@@ -15,15 +15,7 @@ class ArtistsController < ApplicationController
   end
 
   def banned
-    @artists = Artist.where("is_banned = ?", true).order("name")
-    respond_with(@artists) do |format|
-      format.xml do
-        render :xml => @artists.to_xml(:include => [:urls], :root => "artists")
-      end
-      format.json do
-        render :json => @artists.to_json(:include => [:urls])
-      end
-    end
+    redirect_to artists_path(search: { is_banned: "true", order: "updated_at" })
   end
 
   def ban

app/views/artists/_secondary_links.html.erb

@@ -1,7 +1,7 @@
 <% content_for(:secondary_links) do %>
   <%= quick_search_form_for(:any_name_or_url_matches, artists_path, "artists", autocomplete: "artist") %>
   <%= subnav_link_to "Listing", artists_path %>
-  <%= subnav_link_to "Banned", banned_artists_path %>
+  <%= subnav_link_to "Banned", artists_path(search: { is_banned: "true", order: "updated_at" }) %>
   <% if CurrentUser.is_member? %>
     <%= subnav_link_to "New", new_artist_path %>
   <% end %>