Allow modifying the region of a BlockArrayClipboard

worldedit-core/src/main/java/com/sk89q/worldedit/extent/clipboard/BlockArrayClipboard.java

@@ -70,7 +70,7 @@ public class BlockArrayClipboard implements Clipboard {
 
     @Override
     public Region getRegion() {
-        return region.clone();
+        return region;
     }
 
     @Override