Integrated: 8321127: ProblemList java/util/stream/GatherersTest.java

[Daniel D. Daugherty]

A trivial fix to ProblemList java/util/stream/GatherersTest.java.

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Commit messages:
 - 8321127: ProblemList java/util/stream/GatherersTest.java

Changes: https://git.openjdk.org/jdk/pull/16909/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16909&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8321127
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/16909.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16909/head:pull/16909

PR: https://git.openjdk.org/jdk/pull/16909