util/interval: fix BenchmarkBTreeDeleteInsertCloneEachTime

The benchmark was not using the subtest's `b.N`, so it was getting bogus results. This confused cockroachdb#62212, which saw a regression from 0.000008611111111 nanoseconds to 0.0000101 nanoseconds. With this fix, the benchmark no longer shows any movement over the past release.
nvanbenschoten · Mar 20, 2021 · 3a6b152 · 3a6b152
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diff --git a/pkg/kv/kvserver/concurrency/lockstate_interval_btree_test.go b/pkg/kv/kvserver/concurrency/lockstate_interval_btree_test.go
diff --git a/pkg/kv/kvserver/spanlatch/latch_interval_btree_test.go b/pkg/kv/kvserver/spanlatch/latch_interval_btree_test.go