RFR: 8254605: repaint on Android broken

[Johan Vos]

Don't check on windows visiblity when requesting focus.
For a new window, the call to requestFocus is done before the visibility is set to true.
Fix for JDK-8254605

-------------

Commit messages:
 - Don't check on windows visiblity when requesting focus.

Changes: https://git.openjdk.java.net/jfx/pull/322/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=322&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8254605
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jfx/pull/322.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/322/head:pull/322

PR: https://git.openjdk.java.net/jfx/pull/322