fix: query for datasets api (#1261)

Author: nikhilsinhaparseable

src/prism/logstream/mod.rs

@@ -336,7 +336,7 @@ impl PrismDatasetRequest {
         field: &str,
     ) -> Result<Vec<String>, QueryError> {
         let query = Query {
-            query: format!("SELECT DISTINCT({field}) FOR {stream_name}"),
+            query: format!("SELECT DISTINCT({field}) FROM {stream_name}"),
             start_time: "1h".to_owned(),
             end_time: "now".to_owned(),
             send_null: false,