Fix: XmlSerializer generic type changed from T to TS

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: SoloByte

ShapeEngine/Serialization/XmlStructSerializer.cs

@@ -190,7 +190,7 @@ public static List<string> Serialize<TS>(List<TS> instances) where TS : struct
     /// </remarks>
     public static TS Deserialize<TS>(string xml) where TS : struct
     {
-        var serializer = new XmlSerializer(typeof(T));
+        var serializer = new XmlSerializer(typeof(TS));
         using var reader = new StringReader(xml);
         object? result = serializer.Deserialize(reader);