[jdk17u-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 17.0.15-oracle.

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Commit messages:
 - Backport 7d1bbff076c063d066951eedb21de7e694e588b3

Changes: https://git.openjdk.org/jdk17u-dev/pull/3164/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3164&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/jdk17u-dev/pull/3164.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3164/head:pull/3164

PR: https://git.openjdk.org/jdk17u-dev/pull/3164