fixup kvs yesteday

pool.js

@@ -107,7 +107,7 @@ function update_new_day() {
     "KVS.Set",
     { key: "pool.temp_yesterday", value: status.temp_yesterday },
     function (result) {
-      print("[POOL] KVS set: ", JSON.stringify(result));
+      print("[POOL] KVS set temp_yesterday: ", JSON.stringify(result));
     }
   );
 }