terraform: Fix firewall "apply_to" labels

terraform/firewall.tf

@@ -2,7 +2,7 @@
 resource "hcloud_firewall" "k8s-node" {
   name = "k8s-node"
   apply_to {
-    label_selector = "k8s.io/node=true"
+    label_selector = "k8s.io/node"
   }
 
   # ICMP is always a good idea
@@ -78,7 +78,7 @@ resource "hcloud_firewall" "k8s-node" {
 resource "hcloud_firewall" "k8s-master" {
   name = "k8s-master"
   apply_to {
-    label_selector = "k8s.io/master=true"
+    label_selector = "k8s.io/master"
   }
 
   # ICMP is always a good idea
@@ -125,7 +125,7 @@ resource "hcloud_firewall" "k8s-master" {
 resource "hcloud_firewall" "k8s-ingress" {
   name = "k8s-ingress"
   apply_to {
-    label_selector = "k8s.io/ingress=true"
+    label_selector = "k8s.io/ingress"
   }
 
   # ICMP is always a good idea