ansible-playbooks/general#85 Fix some complex when statements

tasks/main.yml

@@ -12,4 +12,4 @@
     - name: Import spideroak
       import_tasks: spideroak.yml
 
-  when: not excluded_roles or "spideroak" not in excluded_roles and spideroak_username is defined and spideroak_username != ""
+  when: (not excluded_roles or "spideroak" not in excluded_roles) and spideroak_username is defined and spideroak_username != ""