[jdk21u-dev] RFR: 8328553: Get rid of JApplet in test/jdk/sanity/client/lib/SwingSet2/src/DemoModule.java

[Goetz Lindenmaier]

I backport this for parity with 21.0.7-oracle

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Commit messages:
 - Backport 7d1bbff076c063d066951eedb21de7e694e588b3

Changes: https://git.openjdk.org/jdk21u-dev/pull/1282/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1282&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328553
  Stats: 12 lines in 1 file changed: 1 ins; 8 del; 3 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1282.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1282/head:pull/1282

PR: https://git.openjdk.org/jdk21u-dev/pull/1282