优化实例列表，限制宽度防止出现水平滚动条 (#5243)

HMCL/src/main/java/org/jackhuang/hmcl/ui/versions/GameListCell.java

@@ -82,6 +82,7 @@ public final class GameListCell extends ListCell<GameListItem> {
         {
             HBox center = new HBox();
             root.setCenter(center);
+            center.setPrefWidth(Region.USE_PREF_SIZE);
             center.setSpacing(8);
             center.setAlignment(Pos.CENTER_LEFT);