fix: 修正[旧版]分类的lang key为carpet.category.旧版

Carpet分类的lang key直接使用分类字符串本身，而非小写常量名。

src/main/resources/assets/slsaddition/lang/en_us.json

@@ -2,7 +2,7 @@
   "carpet.category.pca": "PCA Adaption",
   "carpet.category.needClient":"Need client support",
   "carpet.category.protocol":"Protocol",
-  "carpet.category.legacy": "Legacy",
+  "carpet.category.旧版": "Legacy",
   
 
   "carpet.rule.obtainableReinforcedDeepSlate.name": "Obtainable reinforced deep slate",

src/main/resources/assets/slsaddition/lang/zh_cn.json

@@ -2,7 +2,7 @@
   "carpet.category.pca": "PCA适配",
   "carpet.category.needClient": "需要客户端支持",
   "carpet.category.protocol": "协议",
-  "carpet.category.legacy": "旧版",
+  "carpet.category.旧版": "旧版",
 
 
   "carpet.rule.obtainableReinforcedDeepSlate.name": "强化深板岩可获取",