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ARROW-13419: [JS] Fix perf tests

Fixes https://github.com/ursacomputing/benchmarks/issues/35#issuecomment-883775690 found by @dianaclarke.

Closes #10761 from domoritz/dom/perf

Authored-by: Dominik Moritz <domoritz@gmail.com>
Signed-off-by: Dominik Moritz <domoritz@gmail.com>