[jfx17u] Integrated: 8274022: Additional Memory Leak in ControlAcceleratorSupport

[Kevin Rushforth]

Clean backport to `jfx17u`.

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Commit messages:
 - 8274022: Additional Memory Leak in ControlAcceleratorSupport

Changes: https://git.openjdk.java.net/jfx17u/pull/21/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx17u&pr=21&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8274022
  Stats: 46 lines in 2 files changed: 33 ins; 0 del; 13 mod
  Patch: https://git.openjdk.java.net/jfx17u/pull/21.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx17u pull/21/head:pull/21

PR: https://git.openjdk.java.net/jfx17u/pull/21