Fix ItemType#POPLAR_SHELF bad ItemMeta

Author: Doc94

paper-api/src/main/java/org/bukkit/inventory/ItemType.java

@@ -2368,7 +2368,7 @@ interface Typed<M extends ItemMeta> extends ItemType {
 
     ItemType.Typed<ItemMeta> POPLAR_SAPLING = getItemType("poplar_sapling");
 
-    ItemType.Typed<ItemMeta> POPLAR_SHELF = getItemType("poplar_shelf");
+    ItemType.Typed<BlockStateMeta> POPLAR_SHELF = getItemType("poplar_shelf");
 
     ItemType.Typed<BlockStateMeta> POPLAR_SIGN = getItemType("poplar_sign");