RFR: 8284691: ProblemList javax/swing/JTable/8236907/LastVisibleRow.java on macosx

[Daniel D.Daugherty]

A trivial fix to ProblemList javax/swing/JTable/8236907/LastVisibleRow.java on macosx.

This new bug was filed late Friday and already has 6 sightings.

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Commit messages:
 - 8284691: ProblemList javax/swing/JTable/8236907/LastVisibleRow.java on macosx

Changes: https://git.openjdk.java.net/jdk/pull/8186/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8186&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8284691
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8186.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8186/head:pull/8186

PR: https://git.openjdk.java.net/jdk/pull/8186