RFR: 8295006: Colored text is not shown on disabled checkbox and radio button with GTK LAF for bug4314194. [v4]

[Abhishek Kumar]

> Existing test `open/test/jdk/javax/swing/JRadioButton/4314194/bug4314194.java` was not showing colored text for disabled checkbox and radiobutton in GTK LAF.
> 
> The fix is to get the disabled state color for checkbox and radiobutton from UIManager if it exists. 
> 
> Test case `open/test/jdk/javax/swing/JRadioButton/4314194/bug4314194.java` has been checked in CI pipeline. Link is attached in JBS.

Abhishek Kumar has updated the pull request incrementally with one additional commit since the last revision:

  Used bitwise operator for condition check

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Changes:
  - all: https://git.openjdk.org/jdk/pull/10755/files
  - new: https://git.openjdk.org/jdk/pull/10755/files/3b5cb484..81dc7768

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10755&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10755&range=02-03

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/10755.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10755/head:pull/10755

PR: https://git.openjdk.org/jdk/pull/10755