Fix _network_data fact in create_cloud_init_iso.yml

We need curly brackets to resolve the value, instead of setting
the fact to string `vm_data.networkconfig` ...

Jira: OSPRH-17107

Author: hjensas

roles/libvirt_manager/tasks/create_cloud_init_iso.yml

@@ -50,12 +50,12 @@
       when:
         - vm_data.networkconfig | type_debug == "dict"
       ansible.builtin.set_fact:
-        _network_data: vm_data.networkconfig
+        _network_data: "{{ vm_data.networkconfig }}"
     - name: "Define the network config for each vm"
       when:
         - vm_data.networkconfig | type_debug == "list"
       ansible.builtin.set_fact:
-        _network_data: vm_data.networkconfig[vm_idx]
+        _network_data: "{{ vm_data.networkconfig[vm_idx] }}"
 
 - name: "Call the config_drive role"
   vars: