[backport] [R] Fix threads used to create DMatrix in predict. (#8681)#8682

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trivialfis merged 1 commit intodmlc:release_1.7.0from trivialfis:backport-8681

Jan 14, 2023

+2-1

Commits on Jan 14, 2023

[R] Fix threads used to create DMatrix in predict. (dmlc#8681 )
trivialfis
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