Minor: remove uncessary #cfg test #19798

Job	Run time
build with wasm-pack	1m 49s
Check cargo fmt	36s
cargo test (mac)	15m 51s
cargo check	2m 27s
Verify MSRV	10m 43s
Verify Vendored Code	1m 7s
cargo test (win64)	25m 37s
cargo test doc (amd64)	9m 22s
cargo doc	3m 14s
cargo test datafusion-cli (amd64)	5m 1s
cargo test (amd64)	7m 22s
cargo examples (amd64)	4m 34s
verify benchmark results (amd64)	19m 39s
check Cargo.toml formatting	1m 54s
clippy	8m 43s
check configs.md is up-to-date	3m 53s
cargo test hash collisions (amd64)	7m 3s
Run sqllogictest with Postgres runner	3m 13s
cargo test pyarrow (amd64)	4m 19s
	2h 16m 27s

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