Fix javac workaround in ItemStackTest

By: Wesley Wolfe <weswolf@aol.com>

paper-server/src/test/java/org/bukkit/craftbukkit/inventory/ItemStackTest.java

@@ -316,20 +316,17 @@ public class ItemStackTest extends AbstractTestingBase {
     static final Material[] COMPOUND_MATERIALS;
     static final int NAME_PARAMETER = 2;
     static {
-        COMPOUND_MATERIALS = new Object() { // Workaround for JDK5
-            Material[] value() {
         final ItemFactory factory = CraftItemFactory.instance();
         final Map<Class<? extends ItemMeta>, Material> possibleMaterials = new HashMap<Class<? extends ItemMeta>, Material>();
+        ItemMeta meta;
         for (final Material material : Material.values()) {
-                    final ItemMeta meta = factory.getItemMeta(material);
+            meta = factory.getItemMeta(material);
             if (meta == null || possibleMaterials.containsKey(meta.getClass()))
                 continue;
             possibleMaterials.put(meta.getClass(), material);
 
         }
-                return possibleMaterials.values().toArray(new Material[possibleMaterials.size()]);
-            }
-        }.value();
+        COMPOUND_MATERIALS = possibleMaterials.values().toArray(new Material[possibleMaterials.size()]);
     }
 
     @Parameter(0) public StackProvider provider;