fix(testing): Fix orderdate length in testShowColumns (#26504)

## Description
Fixes expected `orderdate` length in `testShowColumns` for `DWRF` file
format.

## Motivation and Context
Required by tests to be added in #23671 .


```
== NO RELEASE NOTE ==
```

Author: pramodsatya

presto-tests/src/main/java/com/facebook/presto/tests/AbstractTestQueries.java

@@ -2934,7 +2934,7 @@ public void testShowColumns(@Optional("PARQUET") String storageFormat)
                 .row("custkey", "bigint", "", "", 19L, null, null)
                 .row("orderstatus", "varchar", "", "", null, null, 2147483647L)
                 .row("totalprice", "double", "", "", 53L, null, null)
-                .row("orderdate", orderdateType, "", "", null, null, format.equals("varchar") ? 2147483647L : null)
+                .row("orderdate", orderdateType, "", "", null, null, orderdateType.equals("varchar") ? 2147483647L : null)
                 .row("orderpriority", "varchar", "", "", null, null, 2147483647L)
                 .row("clerk", "varchar", "", "", null, null, 2147483647L)
                 .row("shippriority", "integer", "", "", 10L, null, null)
@@ -2946,7 +2946,7 @@ public void testShowColumns(@Optional("PARQUET") String storageFormat)
                 .row("custkey", "bigint", "", "", 19L, null, null)
                 .row("orderstatus", "varchar(1)", "", "", null, null, 1L)
                 .row("totalprice", "double", "", "", 53L, null, null)
-                .row("orderdate", orderdateType, "", "", null, null, format.equals("varchar") ? 2147483647L : null)
+                .row("orderdate", orderdateType, "", "", null, null, orderdateType.equals("varchar") ? 2147483647L : null)
                 .row("orderpriority", "varchar(15)", "", "", null, null, 15L)
                 .row("clerk", "varchar(15)", "", "", null, null, 15L)
                 .row("shippriority", "integer", "", "", 10L, null, null)