fix: 整合包安装完成回调执行器不统一 (#6446)

HMCL/src/main/java/org/jackhuang/hmcl/game/ModpackHelper.java

@@ -231,7 +231,7 @@ public final class ModpackHelper {
                     .withStagesHints(new Task.StagesHint("hmcl.modpack"), new Task.StagesHint("hmcl.modpack.download", List.of("hmcl.install.assets", "hmcl.install.libraries")));
         else
             return modpack.getInstallTask(repository.getDependency(), zipFile, name, iconUrl)
-                    .whenComplete(Schedulers.javafx(), success, failure)
+                    .whenComplete(Schedulers.defaultScheduler(), success, failure)
                     .withStagesHints(new Task.StagesHint("hmcl.modpack"), new Task.StagesHint("hmcl.modpack.download", List.of("hmcl.install.assets", "hmcl.install.libraries")));
     }