CKV_AWS_312: Terraform code provided to fix issue is incorrect

As per [CKV_AWS_312](https://docs.prismacloud.io/en/enterprise-edition/policy-reference/aws-policies/aws-general-policies/bc-aws-312), the way to enable EnhancedHealthStreaming for Elastic BeanStalk environment is to set `HealthStreamingEnabled` to `true`. However this attribute does not exist in the [AWS docs](https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/command-options-general.html#command-options-general-elasticbeanstalkhealthreporting) for Elastic BeanStalk environments configuration.

I suppose that the correct settings instead are:
```go
setting {
namespace = "aws:elasticbeanstalk:healthreporting:system"
name = "SystemType"
value = "enhanced"
}
setting {
namespace = "aws:elasticbeanstalk:healthreporting:system"
name = "EnhancedHealthAuthEnabled"
value = "true"
}
```

I will attempt to create a PR to fix this, however I am not familiar with go neither this project so I'd truly appreciate your input.