Minor: Fix bench.sh tpch data

[alamb]

Which issue does this PR close?

Closes #.

Rationale for this change

While reviewing #10894 I noticed the tpch data generator seems broken

andrewlamb@Andrews-MacBook-Pro-2:~/Software/datafusion$ ./benchmarks/bench.sh data
...

warning: field `range` is never read
   --> datafusion/physical-expr/src/window/window_expr.rs:562:9
    |
561 | pub struct NthValueState {
    |            ------------- field in this struct
562 |     pub range: Range<usize>,
    |         ^^^^^
    |
    = note: `NthValueState` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
    = note: `#[warn(dead_code)]` on by default

warning: `datafusion-physical-expr` (lib) generated 1 warning
    Finished `release-nonlto` profile [optimized] target(s) in 0.10s
     Running `/Users/andrewlamb/Software/datafusion/target/release-nonlto/tpch convert --input /Users/andrewlamb/Software/datafusion/benchmarks/data/tpch_sf1 --prefer_hash_join true --output /Users/andrewlamb/Software/datafusion/benchmarks/data/tpch_sf1 --format parquet`
error: Found argument '--prefer_hash_join' which wasn't expected, or isn't valid in this context

What changes are included in this PR?

fix the script

Are these changes tested?

Are there any user-facing changes?

[alamb]

the convert command doesn't take the --prefer_hash_join .. option

[comphead]

oops, it was my bad

[comphead]

lgtm thanks @alamb