Read FlatItem correctly & fix incoming Item type

common/src/main/java/us/myles/ViaVersion/api/type/types/minecraft/FlatItemType.java

@@ -17,6 +17,7 @@ public class FlatItemType extends BaseItemType {
         } else {
             Item item = new Item();
             item.setId(id);
+            item.setAmount(buffer.readByte());
             item.setTag(Type.NBT.read(buffer));
             return item;
         }

common/src/main/java/us/myles/ViaVersion/protocols/protocolsnapshotto1_12_2/MetadataRewriter.java

@@ -55,9 +55,5 @@ public class MetadataRewriter {
                 }
             }
         }
-
-        for (Metadata metadata : metadatas) {
-            System.out.println(metadata.getMetaType() instanceof MetaType1_13);
-        }
     }
 }

common/src/main/java/us/myles/ViaVersion/protocols/protocolsnapshotto1_12_2/packets/InventoryPackets.java

@@ -137,7 +137,7 @@ public class InventoryPackets {
                         handler(new PacketHandler() {
                             @Override
                             public void handle(PacketWrapper wrapper) throws Exception {
-                                Item item = wrapper.get(Type.FLAT_ITEM, 0);
+                                Item item = wrapper.get(Type.ITEM, 0);
                                 toServer(item);
                             }
                         });
@@ -155,7 +155,7 @@ public class InventoryPackets {
                         handler(new PacketHandler() {
                             @Override
                             public void handle(PacketWrapper wrapper) throws Exception {
-                                Item item = wrapper.get(Type.FLAT_ITEM, 0);
+                                Item item = wrapper.get(Type.ITEM, 0);
                                 toServer(item);
                             }
                         });