RFR: 8345566: Deproblemlist test/jdk/javax/swing/JComboBox/6559152/bug6559152.java

[Prasanta Sadhukhan]

test/jdk/javax/swing/JComboBox/6559152/bug6559152.java does not seem to fail in listed CI job but is problemlisted.
Test is passing in several OCI systems so deproblemlisting..

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Commit messages:
 - test fix

Changes: https://git.openjdk.org/jdk/pull/22570/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22570&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8345566
  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/22570.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22570/head:pull/22570

PR: https://git.openjdk.org/jdk/pull/22570