Opt in to automatic log bucket creation

Now ACLs aren't enabled by default in logging buckets.

So I need to specify the ACL settings myself.

I don't know the right ACL settings for CloudFront distro logging
buckets.

But enableLogging: true creates a bucket for me.

aws/aws-cdk#25358
https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_cloudfront-readme.html#logging

infra/lib/madliberation-webapp.ts

@@ -72,7 +72,7 @@ export class MadliberationWebapp extends Stack {
     }
 
     const distroProps: any = {
-      logBucket: appBucket(this, "DistroLoggingBucket"),
+      enableLogging: true,
       logFilePrefix: "distribution-access-logs/",
       logIncludesCookies: true,
       defaultBehavior: {