Fix indentation for unattended_origins_patterns in template file

Signed-off-by: Norman Ziegner <norman.ziegner@ufz.de>

templates/unattended-upgrades.j2

@@ -36,7 +36,7 @@ APT::Periodic::RandomSleep "{{unattended_random_sleep}}";
 Unattended-Upgrade::Origins-Pattern {
 {% if unattended_origins_patterns is defined %}
   {% for origin in unattended_origins_patterns %}
-    "{{ origin }}";
+   "{{ origin }}";
   {% endfor %}
 {% else %}
   {% for origin in __unattended_origins_patterns %}