update integration test

Signed-off-by: Ruihang Xia <waynestxia@gmail.com>

tests-integration/src/tests/instance_test.rs

@@ -1873,12 +1873,7 @@ async fn test_custom_storage(instance: Arc<dyn MockInstance>) {
                     a int null primary key,
                     ts timestamp time index,
                 )
-                PARTITION BY RANGE COLUMNS (a) (
-                    PARTITION r0 VALUES LESS THAN (1),
-                    PARTITION r1 VALUES LESS THAN (10),
-                    PARTITION r2 VALUES LESS THAN (100),
-                    PARTITION r3 VALUES LESS THAN (MAXVALUE),
-                )
+                PARTITION ON COLUMNS (a) ()
                 with(storage='{storage_name}')
                 "#
                 )