RFR: 8338425: java.lang.NullPointerException when About MenuItem is selected from SwingSet2DemoTest.java

[lawrence.andrews]

Added the missing jpg file & tested and NPE is not seen any more

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Commit messages:
 - 8338425: java.lang.NullPointerException when About MenuItem is selected from SwingSet2DemoTest.java

Changes: https://git.openjdk.org/jdk/pull/20589/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20589&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8338425
  Stats: 0 lines in 1 file changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/20589.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20589/head:pull/20589

PR: https://git.openjdk.org/jdk/pull/20589