[BUG] Default values for pControlTowerRegionsOnly are not consistent

### Describe the bug

Default values for pControlTowerRegionsOnly are not consistent across stacks

### To Reproduce

Steps to reproduce the behavior:

1. Try to deploy guardduty stack **w/o** specifying value for pControlTowerRegionsOnly
2. aws cloudformation deploy --template-file aws_sra_examples/easy_setup/templates/sra-easy-setup.yaml --stack-name sra-easy-setup --s3-bucket --capabilities CAPABILITY_NAMED_IAM --parameter-overrides pDeployGuardDutySolution=Yes pSRAAlarmEmail=
3. Custom resource lambda times out after 15min because it tries to deploy Guard duty in **all** AWS regions.
### Expected behavior

Guardduty to be setup in **Control Tower governed regions only**.

### Deployment Environment (please complete the following information)

- Deployment Framework [e.g. Customizations for Control Tower and CloudFormation StackSets]:
CloudFormation StackSets
- Deployment Framework Version [e.g. 1.0, 2.0]:
Main branch

### Additional context

Fork with fix: https://github.com/wolfit/aws-security-reference-architecture-examples
Please advice how I can contribute or make a pull request