RFR: 8255241: [TestBug] Re-enable few ignored tests in javafx.controls module that pass with latest code

[Ajit Ghaisas]

Some of the ignored unit tests in javafx.controls module pass with latest code.
This bug is to address -
- removal of ignored tag
- fixing the test if fix is minor

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Commit messages:
 - remove-whitespace
 - JDK-8255241-fix

Changes: https://git.openjdk.java.net/jfx/pull/331/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=331&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8255241
  Stats: 37 lines in 10 files changed: 5 ins; 21 del; 11 mod
  Patch: https://git.openjdk.java.net/jfx/pull/331.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/331/head:pull/331

PR: https://git.openjdk.java.net/jfx/pull/331