cockroach: both branches of `if-else` are identical

[chavacava]

Both branches of the following if-else are identical

https://github.com/cockroachdb/cockroach/blob/b7b76a1aed9fb67f3667f00c79355812525ae738/pkg/util/tracing/span_test.go#L938-L942

Found with revive

Jira issue: CRDB-43538

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