Removed unused code from initial_state and ReactController

• Removed:
- unused code from initial_state and ReactController

app/presenters/initial_state_presenter.rb

@@ -2,5 +2,5 @@
 
 class InitialStatePresenter < ActiveModelSerializers::Model
   attributes :settings, :push_subscription, :token,
-             :current_account, :admin, :text
+             :current_account, :text
 end

app/presenters/instance_presenter.rb

@@ -51,8 +51,5 @@ class InstancePresenter
   def hero
     @hero ||= Rails.cache.fetch('site_uploads/hero') { SiteUpload.find_by(var: 'hero') }
   end
-
-  def mascot
-    @mascot ||= Rails.cache.fetch('site_uploads/mascot') { SiteUpload.find_by(var: 'mascot') }
-  end
+  
 end