Revert "Enable testing zstd for spark releases 3.2.0 and later (#5898)"

This reverts commit 321f9b9.

Signed-off-by: Jim Brennan <jimb@nvidia.com>

integration_tests/src/main/python/parquet_test.py

@@ -145,9 +145,6 @@ def test_parquet_read_round_trip_binary_as_string(std_input_path, read_func, rea
             conf=all_confs)
 
 parquet_compress_options = ['none', 'uncompressed', 'snappy', 'gzip']
-# zstd is available in spark 3.2.0 and later.
-if not is_before_spark_320():
-    parquet_compress_options.append('zstd')
 # The following need extra jars 'lzo', 'lz4', 'brotli', 'zstd'
 # https://github.com/NVIDIA/spark-rapids/issues/143