Colored text is not shown on disabled checkbox and radio button with GTK LAF for bug4314194

This is a request to REDO the https://bugs.openjdk.org/browse/JDK-8295006
The first iteration of that fix was based on https://bugs.openjdk.org/browse/JDK-8075916 and basic properties, instead, it should honor the synth property.

Most probably in this line
    https://github.com/openjdk/jdk/blob/3037d7e889743ae1eba127394a7ee10a7b59fc1b/src/java.desktop/share/classes/com/sun/java/swing/plaf/gtk/GTKStyle.java#L156
after decoding the synth style we should check that it was set by the application and if not request the color from the GTK.
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