[Bleeding] Cleanup clone methods.

By: Wesley Wolfe <weswolf@aol.com>

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

@@ -100,4 +100,9 @@ public class Diode extends MaterialData implements Directional {
     public String toString() {
         return super.toString() + " facing " + getFacing() + " with " + getDelay() + " ticks delay";
     }
+
+    @Override
+    public Diode clone() {
+        return (Diode) super.clone();
+    }
 }