refactor(editor): 简化iOS重复shell脚本修复逻辑

移除冗余的added状态判断，直接执行框架添加和文件写入操作

Assets/Editor/iOSFixDuplicateShellScript.cs

@@ -81,12 +81,8 @@ public class iOSFixDuplicateShellScript
         proj.ReadFromString(File.ReadAllText(projPath));
 
         string unityFrameworkGuid = proj.GetUnityFrameworkTargetGuid();
-        bool added = proj.AddFrameworkToProject(unityFrameworkGuid, "NetworkExtension.framework", false);
-
-        if (added)
-        {
+        proj.AddFrameworkToProject(unityFrameworkGuid, "NetworkExtension.framework", false);
         File.WriteAllText(projPath, proj.WriteToString());
         Debug.Log("[PostProcess] Added NetworkExtension.framework");
     }
-    }
 }