Make storing and displaying application used to toot opt-in

app/lib/user_settings_decorator.rb

@@ -35,6 +35,7 @@ class UserSettingsDecorator
     user.settings['skin']                = skin_preference if change?('setting_skin')
     user.settings['hide_network']        = hide_network_preference if change?('setting_hide_network')
     user.settings['aggregate_reblogs']   = aggregate_reblogs_preference if change?('setting_aggregate_reblogs')
+    user.settings['show_application']    = show_application_preference if change?('setting_show_application')
   end
 
   def merged_notification_emails
@@ -109,6 +110,10 @@ class UserSettingsDecorator
     boolean_cast_setting 'setting_hide_network'
   end
 
+  def show_application_preference
+    boolean_cast_setting 'setting_show_application'
+  end
+
   def default_language_preference
     settings['setting_default_language']
   end