Revert "Fix dataset-serialize benchmark by setting pre_buffer=False (#152)"

[austin3dickey]

This reverts commit d412d2f.

This benchmark was fixed in apache/arrow#38466.

[github-actions]

Pull Request Test Coverage Report for Build 6947601111

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• 1 of 2 (50.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.02%) to 87.191%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
benchmarks/dataset_serialize_benchmark.py	1	2	50.0%

Totals
Change from base Build 6947233233:	-0.02%
Covered Lines:	1552
Relevant Lines:	1780

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