Use existing arel scopes instead of string ordering (#32801)

app/models/admin/status_filter.rb

@@ -32,7 +32,7 @@ class Admin::StatusFilter
   def scope_for(key, _value)
     case key.to_s
     when 'media'
-      Status.joins(:media_attachments).merge(@account.media_attachments).group(:id).reorder('statuses.id desc')
+      Status.joins(:media_attachments).merge(@account.media_attachments).group(:id).recent
     else
       raise Mastodon::InvalidParameterError, "Unknown filter: #{key}"
     end

app/models/session_activation.rb

@@ -30,6 +30,8 @@ class SessionActivation < ApplicationRecord
 
   DEFAULT_SCOPES = %w(read write follow).freeze
 
+  scope :latest, -> { order(id: :desc) }
+
   class << self
     def active?(id)
       id && exists?(session_id: id)
@@ -48,7 +50,7 @@ class SessionActivation < ApplicationRecord
     end
 
     def purge_old
-      order('created_at desc').offset(Rails.configuration.x.max_session_activations).destroy_all
+      latest.offset(Rails.configuration.x.max_session_activations).destroy_all
     end
 
     def exclusive(id)