refactor(ItemMerge): 移除多余的合成按钮配置项

移除了 ItemMerge.config 文件中两个物品合并配置的冗余属性：
- buttontxt10：合成10次按钮文本
- mergebutton10：合成10次按钮标识

这些属性在给定的上下文中未被使用，删除它们可以简化配置结构，提高代码的可读性和维护性。

LogicServer/data/config/Merge/ItemMerge.config

@@ -2147,8 +2147,6 @@ ItemMergeConfig = {
 				compose = { id = 13, type = 13, count = 250000000 },
 				index = 3,
 				text = "兑换",
-				buttontxt10 = "合成10次",
-				mergebutton10 = 1,
 				Eid = 3402,
 				second_index = 4,
 				table = { { id = 300, type = 0, count = 100 } },
@@ -2173,8 +2171,6 @@ ItemMergeConfig = {
 				compose = { id = 13, type = 13, count = 800000000 },
 				index = 3,
 				text = "兑换",
-				buttontxt10 = "合成10次",
-				mergebutton10 = 1,
 				Eid = 3404,
 				second_index = 4,
 				table = { { id = 301, type = 0, count = 100 } },