fix variable name typo

powerlevel9k.zsh-theme

@@ -1355,9 +1355,9 @@ prompt_dir_writable() {
 
 # Kubernetes Current Context
 prompt_kubecontext() {
-  local kubectl=$(kubectl version 2>/dev/null)
+  local kubectl_version=$(kubectl version 2>/dev/null)
 
-  if [[ -n "kubectl_version" ]]; then
+  if [[ -n "$kubectl_version" ]]; then
     # Get the current Kubernetes config context's namespaece
     local k8s_namespace=$(kubectl config get-contexts --no-headers | grep '*' | awk '{print $5}')
     # Get the current Kuberenetes context