[Bleeding] Cleanup clone methods.

By: Wesley Wolfe <weswolf@aol.com>

paper-api/src/main/java/org/bukkit/material/PistonExtensionMaterial.java

@@ -88,4 +88,9 @@ public class PistonExtensionMaterial extends MaterialData implements Attachable
     public BlockFace getAttachedFace() {
         return getFacing().getOppositeFace();
     }
+
+    @Override
+    public PistonExtensionMaterial clone() {
+        return (PistonExtensionMaterial) super.clone();
+    }
 }