Fix bug in clock offset fallback

included {{ }} inside a default() resulting in an ansible error

Author: goetzk

templates/vm.xml.j2

@@ -2,7 +2,7 @@
   <name>{{ vm.name }}</name>
   <memory>{{ vm.memory_mb | int * 1024 }}</memory>
   <vcpu>{{ vm.vcpus }}</vcpu>
-  {% if vm.clock_offset |default({{ libvirt_vm_clock_offset }}) %}
+  {% if vm.clock_offset |default( libvirt_vm_clock_offset ) %}
   <clock offset="{{ vm.clock_offset }}"/>
   {% else %}
   <clock sync="localtime"/>