fix escaping

{{cookiecutter.packer_name}}/packer.json

@@ -1,6 +1,6 @@
 {
   "variables": {
-    "region"         : "{{ cookiecutter.aws_region }}",
+    "region"         : "{{ cookiecutter.aws_region }}"
     {% raw -%}
  },
   "provisioners": [
@@ -21,6 +21,7 @@
   "builders": [
     {
       "type"          : "amazon-ebs",
+    {% endraw -%}
       "profile"     : "{{ cookiecutter.aws_profile }}",
     {% raw -%}
       "region"        : "{{user `region`}}",