remove duplicate Parameter

Author: rndmh3ro

.kitchen.yml

@@ -22,7 +22,7 @@ provisioner:
   http_proxy: <%= ENV['http_proxy'] || nil %>
   https_proxy: <%= ENV['https_proxy'] || nil %>
   playbook: tests/default.yml
-  ansible_diff: true
+
   ansible_extra_flags:
     - "--skip-tags=sysctl"