Fix run_tpcds data dir (apache#19771)

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- Closes #.

## Rationale for this change

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Running ` ./bench.sh run tpcds` with a freshly created `./bench.sh data
tpcds` fails with the following error:

```
Please prepare TPC-DS data first by following instructions:
  ./bench.sh data tpcds
```

This PR fixes it

## What changes are included in this PR?

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Fixes the `TPCDS_DIR` variable in `run_tpcds`

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just benchmark scripts

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no need

Author: gabotechs

benchmarks/bench.sh

@@ -683,7 +683,7 @@ run_tpch_mem() {
 
 # Runs the tpcds benchmark
 run_tpcds() {
-    TPCDS_DIR="${DATA_DIR}"
+    TPCDS_DIR="${DATA_DIR}/tpcds_sf1"
 
     # Check if TPCDS data directory and representative file exists
     if [ ! -f "${TPCDS_DIR}/web_site.parquet" ]; then