fix: changed matrix server name to matrix domain in element-call config.

roles/custom/matrix-element-call/templates/config.json.j2

@@ -2,7 +2,7 @@
   "default_server_config": {
     "m.homeserver": {
       "base_url": "{{ matrix_homeserver_url }}",
-      "server_name": "{{ matrix_server_name }}"
+      "server_name": "{{ matrix_domain }}"
     }
   },
   "livekit": {