git: openjdk/jfx-sandbox: glass_gtk_bug_squashing: Fix setting x only or y only

[duke]

Changeset: 92e1e3d3
Branch: glass_gtk_bug_squashing
Author:    Thiago Milczarek Sayao <thiago.sayao at gmail.com>
Date:      2025-04-19 21:58:26 +0000
URL:       https://git.openjdk.org/jfx-sandbox/commit/92e1e3d39c749ffb53fe82cd0df9c64125771507

Fix setting x only or y only

! 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/robot/javafx/stage/StageModalityTest.java