MINOR: [R] lint in test_duckdb
MINOR: [R] lint in test_duckdb

Closes #12508 from dragosmg/test_duckdb_lint

Authored-by: Dragoș Moldovan-Grünfeld <9c9f9cb3247c58daa0f64b617331eb35608a8fa0@gmail.com>
Signed-off-by: Jonathan Keane <28d17c45cab2bb8b25bea44a915713e26ce37e1b@gmail.com>

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