Fix first item of creative inventory not showing

connector/src/main/java/org/geysermc/connector/network/session/GeyserSession.java

@@ -226,7 +226,7 @@ public class GeyserSession implements CommandSender {
 
         CreativeContentPacket creativePacket = new CreativeContentPacket();
         for (int i = 0; i < ItemRegistry.CREATIVE_ITEMS.length; i++) {
-            creativePacket.getEntries().put(i, ItemRegistry.CREATIVE_ITEMS[i]);
+            creativePacket.getEntries().put(i + 1, ItemRegistry.CREATIVE_ITEMS[i]);
         }
         upstream.sendPacket(creativePacket);