Fix trying to delete already deleted file when post-processing (#13406)

Fix #13403

lib/paperclip/attachment_extensions.rb

@@ -14,17 +14,6 @@ module Paperclip
       end
     end
 
-    def reprocess_original!
-      old_original_path = path(:original)
-      reprocess!(:original)
-      new_original_path = path(:original)
-
-      if new_original_path != old_original_path
-        @queued_for_delete << old_original_path
-        flush_deletes
-      end
-    end
-
     def variant?(other_filename)
       return true  if original_filename == other_filename
       return false if original_filename.nil?