<i18n dev> RFR: 8344664: Remove some un-used java/sun.security imports in the java.desktop module

[Phil Race]

delete un-used imports and obsolete comments

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Commit messages:
 - 8344664

Changes: https://git.openjdk.org/jdk/pull/22286/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22286&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344664
  Stats: 21 lines in 13 files changed: 0 ins; 21 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/22286.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22286/head:pull/22286

PR: https://git.openjdk.org/jdk/pull/22286