Fix #390

Turns out the FilterBlock's getOrdinal value is from the "get", and does not share the same reference as setOrdinal, whose value is from the "set", would modify.

Because of this, even if #getOrdinal returns 0, we still must update the set with 0 by #setOrdinal.

worldedit-core/src/main/java/com/sk89q/worldedit/extent/MaskingExtent.java

@@ -108,7 +108,7 @@ public class MaskingExtent extends AbstractDelegateExtent implements IBatchProce
     @Override
     public void applyBlock(FilterBlock block) {
         int ordinal = block.getOrdinal();
-        if (ordinal != 0 && !mask.test(getExtent(), block)) {
+        if (!mask.test(getExtent(), block)) {
             block.setOrdinal(0);
         }
     }