Remove legacy materials if there were any

BauSystem_Main/src/de/steamwar/bausystem/features/world/SpectatorListener.java

@@ -59,6 +59,7 @@ public class SpectatorListener implements Listener {
         materials.add(Material.COMPARATOR);
         materials.add(Material.LEVER);
         for (Material value : Material.values()) {
+            if (value.isLegacy()) continue;
             if (value.name().endsWith("_BUTTON")) {
                 materials.add(value);
             }