fix for s3 behaviour change

fix-s3.js

/** 
 * put this file in src/plugins/ and add the following to the arcfile:
 *
 * @plugins
 * fix-s3
 */
module.exports = { deploy: { start }}

async function start ({ arc, cloudformation }) {
  let ref = cloudformation.Resources.StaticBucket.Properties
  ref.PublicAccessBlockConfiguration = {
    BlockPublicAcls: false,
    BlockPublicPolicy: false,
    IgnorePublicAcls: false,
    RestrictPublicBuckets: false,
  }
  return cloudformation
}