Correct check for writing barbican id to file

Currently gives the error below, as the default field is not being
applied to the varriable.

```
TASK [Write barbican Approle ID to file if requested] *************************************************************************
Monday 30 October 2023  09:57:48 +0000 (0:00:00.075)       0:00:07.517 ********
fatal: [controller01 -> localhost]: FAILED! =>
  msg: |-
    The conditional check 'stackhpc_write_barbican_role_id_to_file | bool | default(false)' failed. The error was: error while evaluating conditional (stackhpc_write_barbican_role_id_to_file | bool | default(false)): 'stackhpc_write_barbican_role_id_to_file' is undefined

    The error appears to be in '/var/lib/home/stackhpc/mattc/src/kayobe-config/etc/kayobe/ansible/vault-deploy-barbican.yml': line 80, column 7, but may
    be elsewhere in the file depending on the exact syntax problem.

    The offending line appears to be:

        - name: Write barbican Approle ID to file if requested
          ^ here
```

Author: MoteHue

etc/kayobe/ansible/vault-deploy-barbican.yml

@@ -82,7 +82,7 @@
       copy:
         content: "{{ barbican_role_id.id }}"
         dest: "{{ stackhpc_barbican_role_id_file_path | default('~/barbican-role-id') }}"
-      when: stackhpc_write_barbican_role_id_to_file | bool | default(false)
+      when: stackhpc_write_barbican_role_id_to_file | default(false) | bool
 
     - name: Check if barbican Approle Secret ID is defined
       hashivault_approle_role_secret_list: