Fix admin statuses order(#16937) (#16969)

* Fix #16937

* Add test for statuses order

app/controllers/admin/statuses_controller.rb

@@ -14,7 +14,7 @@ module Admin
       @statuses = @account.statuses.where(visibility: [:public, :unlisted])
 
       if params[:media]
-        @statuses.merge!(Status.joins(:media_attachments).merge(@account.media_attachments.reorder(nil)).group(:id)).reorder('statuses.id desc')
+        @statuses = @statuses.merge(Status.joins(:media_attachments).merge(@account.media_attachments.reorder(nil)).group(:id)).reorder('statuses.id desc')
       end
 
       @statuses = @statuses.preload(:media_attachments, :mentions).page(params[:page]).per(PER_PAGE)