fix amazonbackup

app/models/amazon_backup.rb

@@ -17,7 +17,7 @@ class AmazonBackup < ActiveRecord::Base
       AWS::S3::Base.establish_connection!(
         :access_key_id => Danbooru.config.amazon_s3_access_key_id,
         :secret_access_key => Danbooru.config.amazon_s3_secret_access_key,
-        :server => "s3-us-east-1.amazonaws.com"
+        :server => "s3.amazonaws.com"
       )
 
       if File.exists?(post.file_path)