fix: add missing value_column arg to AggregationConfig::new

The function takes 17 args — was passing only 16 (missing the
value_column: Option<String> parameter).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: zz_y

asap-query-engine/src/bin/test_e2e_precompute.rs

@@ -594,6 +594,7 @@ fn make_sum_agg_config(
         None,
         None,
         None,
+        None,
     )
 }