Make RECORD_12 a record. Fixes BUKKIT-3023

Record 12 was missed when added to the Material enum.

By: Wesley Wolfe <weswolf@aol.com>

paper-api/src/main/java/org/bukkit/Material.java

@@ -536,6 +536,6 @@ public enum Material {
      * @return True if this material represents a playable music disk.
      */
     public boolean isRecord() {
-        return id >= GOLD_RECORD.id && id <= RECORD_11.id;
+        return id >= GOLD_RECORD.id && id <= RECORD_12.id;
     }
 }