Fix appservice port

roles/custom/matrix-bridge-steam/templates/config.yaml.j2

@@ -209,7 +209,7 @@ appservice:
     # The hostname and port where this appservice should listen.
     # For Docker, you generally have to change the hostname to 0.0.0.0.
     hostname: 0.0.0.0
-    port: 4231
+    port: {{ matrix_steam_bridge_appservice_port }}
 
     # The unique ID of this appservice.
     id: steam