tests/01016_input_null_as_default: remove one more tuple nesting

CI report [1]:

    01016_input_null_as_default:                                            [ FAIL ] - having stderror:
    Code: 53. DB::Exception: Bad size of tuple. Expected size: 1, actual size: 2.: While executing ValuesBlockInputFormat: data for INSERT was parsed from stdin. (TYPE_MISMATCH)

  [1]: https://clickhouse-test-reports.s3.yandex.net/28888/5ad9cb9b797abe498ae558f9c233e16cd89e41b4/fast_test.html#fail1

tests/queries/0_stateless/01016_input_null_as_default.sh

@@ -57,8 +57,8 @@ $CLICKHOUSE_CLIENT --query="TRUNCATE TABLE null_as_default";
 
 echo 'Values'
 echo '(NULL, '\''1'\'', (null), '\''2019-07-22'\'', ([10, 20, 30]), (NuLl)),
-(1, '\''world'\'', (3), '\''2019-07-23'\'', (NULL), (('\''tuple'\'', 3.14))),
-(2, null, (123), null, ([]), (('\''test'\'', 2.71828))),
+(1, '\''world'\'', (3), '\''2019-07-23'\'', (NULL), ('\''tuple'\'', 3.14)),
+(2, null, (123), null, ([]), ('\''test'\'', 2.71828)),
 (3, null, (null), null, (null), (null))' | $CLICKHOUSE_CLIENT --input_format_null_as_default=1 --query="INSERT INTO null_as_default VALUES";
 $CLICKHOUSE_CLIENT --query="SELECT * FROM null_as_default ORDER BY i";
 $CLICKHOUSE_CLIENT --query="DROP TABLE null_as_default";