git: openjdk/jfx-sandbox: glass_gtk_bug_squashing: Fix tests

[duke]

Changeset: 80f52ea1
Branch: glass_gtk_bug_squashing
Author:    Thiago Milczarek Sayao <thiago.sayao at gmail.com>
Date:      2025-04-17 19:39:48 +0000
URL:       https://git.openjdk.org/jfx-sandbox/commit/80f52ea1dbd33be9f58d205183b3bcb7dc91c7d2

Fix tests

! tests/system/src/test/java/test/robot/javafx/stage/StageMixedSizeTest.java
+ tests/system/src/test/java/test/robot/javafx/stage/StageModalityTests.java
! tests/system/src/test/java/test/util/Util.java