Revert "fix windows taints"

This reverts commit 661b543e08.

modules/gke-nodepool/main.tf

@@ -47,12 +47,13 @@ locals {
       "https://www.googleapis.com/auth/userinfo.email"
     ]
   )
-  taints = merge(var.taints, !local.image.is_win ? {} : {
-    "node.kubernetes.io/os" = {
-      value  = "windows"
-      effect = "NO_EXECUTE"
-    }
-  })
+  taints_windows = (
+    local.image.is_win
+    ? [{
+      key = "node.kubernetes.io/os", value = "windows", effect = "NO_EXECUTE"
+    }]
+    : []
+  )
 }
 
 resource "google_service_account" "service_account" {
@@ -214,7 +215,7 @@ resource "google_container_node_pool" "nodepool" {
       }
     }
     dynamic "taint" {
-      for_each = local.taints
+      for_each = var.taints
       content {
         key    = taint.key
         value  = taint.value.value