Fix: added string to bool conversion for use_localhost_as_kube api load balancer (#7324)

(cherry picked from commit 15f1b19136)

roles/kubespray-defaults/defaults/main.yaml

@@ -442,7 +442,7 @@ apiserver_loadbalancer_domain_name: "lb-apiserver.kubernetes.local"
 kube_apiserver_global_endpoint: |-
   {% if loadbalancer_apiserver is defined -%}
       https://{{ apiserver_loadbalancer_domain_name }}:{{ loadbalancer_apiserver.port|default(kube_apiserver_port) }}
-  {%- elif use_localhost_as_kubeapi_loadbalancer is defined -%}
+  {%- elif use_localhost_as_kubeapi_loadbalancer|default(False)|bool -%}
       https://127.0.0.1:{{ kube_apiserver_port }}
   {%- else -%}
       https://{{ first_kube_master }}:{{ kube_apiserver_port }}