git: openjdk/jfx-sandbox: glass_gtk_bug_squashing: Revert WhiteBackground (setting backcground and opacity is broken)

[duke]

Changeset: e6a6ae4d
Branch: glass_gtk_bug_squashing
Author:    Thiago Milczarek Sayao <thiago.sayao at gmail.com>
Date:      2025-04-21 11:48:04 +0000
URL:       https://git.openjdk.org/jfx-sandbox/commit/e6a6ae4dcd1755bbe40f9045fea5a3ff86e23d72

Revert WhiteBackground (setting backcground and opacity is broken)

! modules/javafx.graphics/src/main/native-glass/gtk/GlassApplication.cpp
! modules/javafx.graphics/src/main/native-glass/gtk/glass_window.cpp
! modules/javafx.graphics/src/main/native-glass/gtk/glass_window.h
! tests/system/src/test/java/test/javafx/stage/CenterOnScreenTest.java
! tests/system/src/test/java/test/javafx/stage/SizingTest.java
! tests/system/src/test/java/test/javafx/stage/StageTestBase.java
! tests/system/src/test/java/test/robot/javafx/stage/StageOwnershipTest.java
- tests/system/src/test/java/test/robot/javafx/stage/StageWhiteBackgroundTest.java