Correct true and false OpsWorks string values to fix manage_bundler config bug

[dlanner]

This PR implements the small change provided by @u2mejc in his comment on issue #5907, in order to fix a bug where the aws_opsworks_rails_app_layer resource's manage_bundler parameter is ignored, so no matter if you set it to true, false, or don't even set it, the created Rails layer's "Install and manage Bundler" setting is unconditionally "No".

There are no existing acceptance tests for resource_aws_opsworks_rails_app_layer. Unfortunately, I don't have the time to write them, although it seems like it would be a good opportunity to learn a little Go.

But I did compile Terraform in Vagrant (make dev) with this change and tested my Terraform template file which set manage_bundler = true, and it resulted in the created Rails layer having "Install and manage Bundler" set to "yes". So it does fix that issue, as @u2mejc said.

[stack72]

Hi @dlanner

Thanks so much for this PR - this LGTM!

Paul

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