RFR: 8295855: ProblemList jdk/jshell/CommandCompletionTest.java on linux-all

[Daniel D. Daugherty]

A trivial fix to ProblemList jdk/jshell/CommandCompletionTest.java on linux-all.

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Commit messages:
 - 8295855: ProblemList jdk/jshell/CommandCompletionTest.java on linux-all

Changes: https://git.openjdk.org/jdk/pull/10841/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10841&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8295855
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/10841.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10841/head:pull/10841

PR: https://git.openjdk.org/jdk/pull/10841