Correct reference to userdata_template_extra_args

Prior to this change, both node_groups user_data_template_file and
user_data_template_extra_args referred to userdata_template_file from
the parent module, which was wrong.

This change corrects the reference from
node_groups.user_data_template_extra_args to
userdata_template_extra_args.

modules/node_groups/locals.tf

@@ -35,7 +35,7 @@ locals {
       metadata_http_put_response_hop_limit = var.workers_group_defaults["metadata_http_put_response_hop_limit"]
       ami_is_eks_optimized                 = true
       user_data_mime_type                  = "text/x-shellscript"
-      user_data_template_extra_args        = lookup(var.workers_group_defaults, "userdata_template_file", {})
+      user_data_template_extra_args        = lookup(var.workers_group_defaults, "userdata_template_extra_args", {})
       user_data_template_file              = lookup(var.workers_group_defaults, "userdata_template_file", "${path.module}/templates/userdata.sh.tpl")
     },
     var.node_groups_defaults,