[SPARK-21831][TEST] Remove `spark.sql.hive.convertMetastoreOrc` config in HiveCompatibilitySuite

## What changes were proposed in this pull request?

[SPARK-19025](https://github.com/apache/spark/pull/16869) removes SQLBuilder, so we don't need the following in HiveCompatibilitySuite.

```scala
// Ensures that the plans generation use metastore relation and not OrcRelation
// Was done because SqlBuilder does not work with plans having logical relation
TestHive.setConf(HiveUtils.CONVERT_METASTORE_ORC, false)
```

## How was this patch tested?

Pass the existing Jenkins tests.

Author: Dongjoon Hyun <dongjoon@apache.org>

Closes #19043 from dongjoon-hyun/SPARK-21831.