Make TCP the default allowed firewall protocol

Custom protocol can still be specified by adding `proto: "proto"` to a
loop item.

roles/ubuntu_base/tasks/firewall.yml

@@ -3,39 +3,20 @@
   community.general.ufw: 
     state: enabled
     policy: deny
+
 - name: Allow necessary ports
   community.general.ufw:
     rule: allow
     port: "{{ item.port }}"
-    proto: "{{ item.proto }}"
+    proto: "{{ item.proto | default('tcp') }}"
   loop:
-    # Gitea SSH
-    - port: 22
-      proto: "tcp"  
-    # HTTP
-    - port: 80
-      proto: "tcp"
-    # HTTPS
-    - port: 443
-      proto: "tcp"
-    # OpenLDAP
-    - port: 389
-      proto: "tcp"
-    # OpenLDAP
-    - port: 636
-      proto: "tcp"
-    # Email
-    - port: 25
-      proto: "tcp"
-    # Email
-    - port: 465
-      proto: "tcp"
-    # Email
-    - port: 587
-      proto: "tcp"
-    # Email
-    - port: 993
-      proto: "tcp"
-    # SSH
-    - port: 19022
-      proto: "tcp"
+    - port: 22     # Gitea SSH
+    - port: 80     # HTTP
+    - port: 443    # HTTPS
+    - port: 389    # OpenLDAP
+    - port: 636    # OpenLDAP
+    - port: 25     # Email
+    - port: 465    # Email
+    - port: 587    # Email
+    - port: 993    # Email
+    - port: 19022  # SSH