Fix cannot use resource from hero inventory part 2 (#155)

Refactor the `IsInventoryPage` method in `InventoryParser.cs` to change the logic for selecting `<a>` nodes within the `heroDiv` element.
Replaced the `GetAttributeValue` check for `data-tab` with a `HasClass` check for the `tabItem` class.
This improves the clarity and maintainability of the node selection logic.

Author: vinaghost

MainCore/Parsers/InventoryParser.cs

@@ -7,7 +7,7 @@ public static bool IsInventoryPage(HtmlDocument doc)
             var heroDiv = doc.GetElementbyId("heroV2");
             if (heroDiv is null) return false;
             var aNode = heroDiv.Descendants("a")
-                .FirstOrDefault(x => x.GetAttributeValue("data-tab", 0) == 1);
+                .FirstOrDefault(x => x.HasClass("tabItem"));
             if (aNode is null) return false;
             return aNode.HasClass("active");
         }