Hide buttons on welcome assistant message

public/scripts/welcome-screen.js

@@ -71,7 +71,9 @@ function sendAssistantMessage() {
         mes: t`If you're connected to an API, try asking me something!` + '\n***\n' + t`**Hint:** Set any character as your welcome page assistant from their "More..." menu.`,
         is_system: false,
         is_user: false,
-        extra: {},
+        extra: {
+            type: system_message_types.ASSISTANT_MESSAGE,
+        },
     };
 
     chat.push(message);