fix wrong case of "Count" uses in item

Author: MrXiaoM

modules/library/src/main/java/top/mrxiaom/pluginbase/utils/AdventureItemStack.java

@@ -269,9 +269,13 @@ public static HoverEventSource<?> toHoverEvent(ItemStack item) {
         } else { // 未知格式
             itemTag = BinaryTagHolder.binaryTagHolder("{}");
         }
+
+        int count = nbt.hasTag("Count")
+                ? nbt.getInteger("Count")
+                : nbt.getInteger("count");
         return HoverEvent.showItem(
                 Key.key(nbt.getString("id"), ':'),
-                nbt.getInteger("count"),
+                count,
                 itemTag);
     }