[Bleeding] Cleanup clone methods.

By: Wesley Wolfe <weswolf@aol.com>

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

@@ -103,4 +103,9 @@ public class Button extends SimpleAttachableMaterialData implements Redstone {
     public String toString() {
         return super.toString() + " " + (isPowered() ? "" : "NOT ") + "POWERED";
     }
+
+    @Override
+    public Button clone() {
+        return (Button) super.clone();
+    }
 }