quick fix for 02112_with_fill_interval

Seems like the problem is that now data more often come to FillingTransform in multiple chunks. Don't know why it affects the results, will continue investigation.

tests/queries/0_stateless/02112_with_fill_interval.sql

@@ -1,3 +1,5 @@
+SET max_threads = 1;
+
 DROP TABLE IF EXISTS with_fill_date;
 CREATE TABLE with_fill_date (d Date, d32 Date32) ENGINE = Memory;