message: fix WINDOWS failed test
diff: @@ -69,7 +69,7 @@ test 88 NULL 2020-12-30 01:25:58.745232+01 NULL
  # Test glob pattern [12] and union_by_name with filename options
  query IIIII
  -SELECT a, b, c, ts, filename
  +SELECT a, b, c, ts, replace(filename, '\', '/')
  FROM read_csv_auto('data/csv/union-by-name/ubn[12].csv',FILENAME=TRUE ,UNION_BY_NAME=TRUE)
  ORDER BY a
  ----
  @@ -83,7 +83,7 @@ test 88 NULL 2020-12-30 00:25:58.745232 data/csv/union-by-name/ubn2.csv
  # Test glob pattern [!1-2] and union_by_name with filename options
  query IIII
  -SELECT k, c, ts, filename
  +SELECT k, c, ts, replace(filename, '\', '/')
  FROM read_csv_auto('data/csv/union-by-name/ubn[!1-2].csv',FILENAME=TRUE ,UNION_BY_NAME=TRUE)
  ORDER BY k
  ----
  