[TD-4238]<fix>: taosdemo async subscribe

subsribe sql command do not use aggregation functions.

src/kit/taosdemo/async-sub.json

@@ -15,11 +15,11 @@
     "resubAfterConsume": 10,
     "sqls": [
       {
-        "sql": "select avg(col1) from meters where col1 > 1;",
+        "sql": "select col1 from meters where col1 > 1;",
         "result": "./subscribe_res0.txt"
       },
       {
-        "sql": "select avg(col2) from meters where col2 > 1;",
+        "sql": "select col2 from meters where col2 > 1;",
         "result": "./subscribe_res2.txt"
       }
     ]