[GTK4] Stop disabling Webkit hardware acceleration

hardware-acceleration-policy has always 2 values "always"(0) and
"never"(1) as per https://webkitgtk.org/reference/webkitgtk/stable/enum.HardwareAccelerationPolicy.html
thus value of 2 is no longer supported.
Fixes "(SWT:330330): GLib-GObject-CRITICAL **: 10:47:39.032: value
"((WebKitHardwareAccelerationPolicy) 2)" of type
'WebKitHardwareAccelerationPolicy' is invalid or out of range for
property 'hardware-acceleration-policy' of type
'WebKitHardwareAccelerationPolicy'" when running on GTK4.
As GTK 4 is fairly different from GTK 3 where it was disabled in an
effort to fix crash let's keep the default setting unless there is a
problem that is fixed by disabling hardware acceleration.

Author: akurtakov

bundles/org.eclipse.swt/Eclipse SWT WebKit/gtk/org/eclipse/swt/browser/WebKit.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2010, 2024 IBM Corporation and others.
+ * Copyright (c) 2010, 2025 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -736,7 +736,9 @@ public void create (Composite parent, int style) {
 	OS.g_object_set (settings, WebKitGTK.enable_developer_extras, 1, 0);
 	//disable hardware acceleration due to  https://bugs.webkit.org/show_bug.cgi?id=239429#c11
 	//even evolution ended up doing the same https://gitlab.gnome.org/GNOME/evolution/-/commit/eb62ccaa28bbbca7668913ce7d8056a6d75f9b05
-	OS.g_object_set (settings, WebKitGTK.hardware_acceleration_policy, 2, 0);
+	if (!GTK.GTK4) {
+		OS.g_object_set (settings, WebKitGTK.hardware_acceleration_policy, 2, 0);
+	}
 
 	OS.g_object_set (settings, WebKitGTK.default_charset, utfBytes, 0);
 	if (WebKitGTK.webkit_get_minor_version() >= 14) {