RFR: 8364825: Skip failing MenuDoubleShortcutTest on Linux

[Ziad El Midaoui]

Skipping failing `MenuDoubleShortcutTest#nonMacMenuBarComesBeforeScene()`

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Commit messages:
 - Disabled Test nonMacMenuBarComesBeforeScene()

Changes: https://git.openjdk.org/jfx/pull/1867/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1867&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8364825
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jfx/pull/1867.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1867/head:pull/1867

PR: https://git.openjdk.org/jfx/pull/1867