Fix failing regressions with order by

src/test/regress/expected/multi_mx_router_planner.out

@@ -1204,7 +1204,8 @@ SELECT
 	FROM
 		articles_hash_mx
  	GROUP BY
-		author_id;
+		author_id
+	ORDER BY c;
  c 
 ---
  4

src/test/regress/expected/multi_router_planner.out

@@ -1902,7 +1902,8 @@ SELECT
 	FROM
 		articles_hash
  	GROUP BY
-		author_id;
+		author_id
+	ORDER BY c;
  c 
 ---
  4

src/test/regress/sql/multi_mx_router_planner.sql

@@ -529,7 +529,8 @@ SELECT
 	FROM
 		articles_hash_mx
  	GROUP BY
-		author_id;
+		author_id
+	ORDER BY c;
 
 -- queries inside transactions can be router plannable
 BEGIN;

src/test/regress/sql/multi_router_planner.sql

@@ -911,7 +911,8 @@ SELECT
 	FROM
 		articles_hash
  	GROUP BY
-		author_id;
+		author_id
+	ORDER BY c;
 
 -- queries inside transactions can be router plannable
 BEGIN;