verify_settings: fix bad task name + remove redundant conditions

roles/kubernetes/preinstall/tasks/0040-verify-settings.yml

@@ -45,16 +45,14 @@
     that: kube_network_plugin in ['calico', 'flannel', 'weave', 'cloud', 'cilium', 'cni', 'kube-ovn', 'kube-router', 'macvlan', 'custom_cni', 'none']
     msg: "{{ kube_network_plugin }} is not supported"
   when:
-    - kube_network_plugin is defined
     - not ignore_assert_errors
-- name: Warn the user if they are still using `etcd_kubeadm_enabled`
+
+- name: Warn if `kube_network_plugin` is `none
   debug:
-    msg: >
+    msg: |
       "WARNING! => `kube_network_plugin` is set to `none`. The network configuration will be skipped.
       The cluster won't be ready to use, we recommend to select one of the available plugins"
-  changed_when: true
   when:
-    - kube_network_plugin is defined
     - kube_network_plugin == 'none'
 
 - name: Stop if unsupported version of Kubernetes