MINOR: [R] Remove skip from write_csv_arrow() following ARROW-12540
MINOR: [R] Remove skip from write_csv_arrow() following ARROW-12540

Closes #10891 from nealrichardson/write-csv-date

Authored-by: Neal Richardson <beb59f0141269d2d04e73d0dcc1967b64ba87e13@gmail.com>
Signed-off-by: Jonathan Keane <28d17c45cab2bb8b25bea44a915713e26ce37e1b@gmail.com>

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