Fixed a bug of user name.

Author: ywang103

awswrangler/quicksight/_create.py

@@ -53,8 +53,7 @@
 
 
 def _generate_principal(user_name: str, account_id: str, region: str) -> str:
-    user_name = user_name if "/" in user_name else f"default/{user_name}"
-    return f"arn:aws:quicksight:{region}:{account_id}:user/{user_name}"
+    return f"arn:aws:quicksight:{region}:{account_id}:user/default/{user_name}"
 
 
 def _generate_permissions(