RFR: 8328553: Get rid of JApplet in test/jdk/sanity/client/lib/SwingSet2/src/DemoModule.java [v2]

[lawrence.andrews]

> 1) Replaced JApplet with JPanel 
> 2) Tests passed before and after fix

lawrence.andrews has updated the pull request incrementally with one additional commit since the last revision:

  Removed the JApplet import

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/20450/files
  - new: https://git.openjdk.org/jdk/pull/20450/files/0e30b745..4a39ba80

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20450&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20450&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/20450.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20450/head:pull/20450

PR: https://git.openjdk.org/jdk/pull/20450