fixes Invalid principal deploying IamRoleStateMachineExecution Role bug

Author: r.sora

lib/deploy/stepFunctions/compileIamRole.js

@@ -21,7 +21,7 @@ module.exports = {
         'iam-role-statemachine-execution-template.json'))
     );
     iamRoleStateMachineExecutionTemplate =
-      iamRoleStateMachineExecutionTemplate.replace('[region]', this.region)
+      iamRoleStateMachineExecutionTemplate.replace('[region]', this.options.region)
       .replace('[PolicyName]', this.getStateMachinePolicyName());
 
     const iamRoleStateMachineLogicalId = this.getiamRoleStateMachineLogicalId();