git: openjdk/jfx-sandbox: glass_gtk_bug_squashing: Test fixes

[duke]

Changeset: 3987fa57
Branch: glass_gtk_bug_squashing
Author:    Thiago Milczarek Sayao <thiago.sayao at gmail.com>
Date:      2025-04-13 20:40:49 +0000
URL:       https://git.openjdk.org/jfx-sandbox/commit/3987fa5765f04e422a1983d15a45fc89a7ee7f5f

Test fixes

! tests/system/src/test/java/test/javafx/stage/CenterOnScreenTest.java
! tests/system/src/test/java/test/javafx/stage/StageTestBase.java