refactor(examples): remove redundant call to create directory in parquet_embedded_index.rs

[jcsherin]

Which issue does this PR close?

• Closes #.

Rationale for this change

There is no need for create_dir_all. The directory is already created by TempDir::new()?, and if that call fails, an error is immediately propagated without ever reaching this line.

What changes are included in this PR?

Removes redundant call to create_dir_all.

Are these changes tested?

Verified that the expected output remains the same with or without the changes.

$ cargo run --example parquet_embedded_indexcargo run --example parquet_embedded_index
...
Reading index at offset: 70, length
Read distinct index for c.parquet: "c.parquet"
Filtering for category: foo
Scanning only files: ["c.parquet", "a.parquet"]
+----------+
| category |
+----------+
| foo      |
| foo      |
| foo      |
+----------+

Are there any user-facing changes?

No.

[alamb]

Thanks @jcsherin