RFR: 8318630: TextAreaBehaviorRobotTest.testNonMacBindings fails on Linux

[Andy Goryachev]

Corrected the test:
ctrl-DOWN moves to the end of the current paragraph (linux) or beginning of the next paragraph (windows).

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Commit messages:
 - linux

Changes: https://git.openjdk.org/jfx/pull/1270/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1270&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8318630
  Stats: 10 lines in 1 file changed: 4 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jfx/pull/1270.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1270/head:pull/1270

PR: https://git.openjdk.org/jfx/pull/1270