RFR: 8335267: [XWayland] move screencast tokens from .awt to .java folder

[Alexander Zvegintsev]

Trivial fix to move the screencast token storage file from `~/.awt/robot/screencast-tokens.properties` to `~/.java/robot/screencast-tokens.properties`, where it should be.
Old location is still valid and will only be used if there is a file in the old location and the new location does not have it.

Along with the fix  `@SuppressWarnings("removal")` is moved to individual items as it was done in [JFX](https://github.com/openjdk/jfx/pull/1490).

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Commit messages:
 - convert to lambdas
 - initial

Changes: https://git.openjdk.org/jdk/pull/20234/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20234&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8335267
  Stats: 40 lines in 1 file changed: 13 ins; 8 del; 19 mod
  Patch: https://git.openjdk.org/jdk/pull/20234.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20234/head:pull/20234

PR: https://git.openjdk.org/jdk/pull/20234