Integrated: 8285938: ProblemList jdk/jshell/HighlightUITest.java on linux-x64

[Daniel D.Daugherty]

A trivial fix to ProblemList jdk/jshell/HighlightUITest.java on linux-x64.

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Commit messages:
 - 8285938: ProblemList jdk/jshell/HighlightUITest.java on linux-x64

Changes: https://git.openjdk.java.net/jdk/pull/8470/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8470&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8285938
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8470.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8470/head:pull/8470

PR: https://git.openjdk.java.net/jdk/pull/8470