fix(wireguard_server): Correct Jinja2 variable syntax

roles/wireguard_server/tasks/wstunnel.yml

@@ -9,7 +9,7 @@
   block:
     - name: Download and unarchive wstunnel package
       ansible.builtin.unarchive:
-        src: "{{ wstunnel-download-url }}"
+        src: "{{ vars['wstunnel-download-url'] }}"
         dest: /tmp
         remote_src: yes
         creates: /tmp/wstunnel
@@ -38,7 +38,7 @@
       [Service]
       Type=simple
       User=nobody
-      ExecStart=/usr/local/bin/wstunnel -s 0.0.0.0:8080 -t udp://127.0.0.1:{{ wireguard-server.internal-port }}
+      ExecStart=/usr/local/bin/wstunnel -s 0.0.0.0:8080 -t udp://127.0.0.1:{{ vars['wireguard-server']['internal-port'] }}
       Restart=always
       RestartSec=3