Correct bucket reference in generated  variables.tf
Correct bucket reference in generated  variables.tf

The generated variables.tf currently looks like:
```
data "terraform_remote_state" "local" {
  backend = "gcs"

  config = {
    bucket = "gs://blah-tf-state"
    prefix = "."
  }
}
```

This change corrects the "bucket" field to:

```
data "terraform_remote_state" "local" {
  backend = "gcs"

  config = {
    bucket = "blah-tf-state"
    prefix = "."
  }
}
```

Without this change, terraform complains that it cannot find
this resource.

```
terraform plan
Refreshing Terraform state in-memory prior to plan...
The refreshed state will be used to calculate this plan, but will not be
persisted to local or remote state storage.

data.terraform_remote_state.local: Refreshing state...

Error: Error loading state error

  on variables.tf line 2, in data "terraform_remote_state" "local":
   2:   backend = "gcs"

error loading the remote state: Failed to open state file at
gs://gs://blah-tf-state/default.tfstate: googleapi: got HTTP response
code 400 with body: <?xml version='1.0'
encoding='UTF-8'?><Error><Code>InvalidBucketName</Code><Message>The specified
bucket is not valid.</Message><Details>Invalid bucket name:
'gs:'</Details></Error>
```

Should have made this change in https://github.com/GoogleCloudPlatform/terraformer/commit/0b249339a1638c634718a67ba952f9750947abf8
but overlooked it... my bad.

GoogleCloudPlatform/terraformer