Fix new dtext shortlinks redirecting to nonexistent pages.

Fix the following dtext shortlinks redirecting to nonexistent pages:

* flag #1
* appeal #1
* mod action #1
* bur #1

app/controllers/mod_actions_controller.rb

@@ -5,4 +5,11 @@ class ModActionsController < ApplicationController
     @mod_actions = ModAction.search(search_params).paginate(params[:page], :limit => params[:limit])
     respond_with(@mod_actions)
   end
+
+  def show
+    @mod_action = ModAction.find(params[:id])
+    respond_with(@mod_action) do |fmt|
+      fmt.html { redirect_to mod_actions_path(search: { id: @mod_action.id }) }
+    end
+  end
 end