Update to sparsetype parsing

src/engine/objects/ItemTemplate.java

@@ -547,8 +547,8 @@ public class ItemTemplate {
 
                 for (Object key : rune_sparse_json.keySet()) {
                     String sparseType = key.toString();
-                    String sparseValue = rune_sparse_json.getString(sparseType);
-                    rune_sparse_data.put(sparseType, sparseValue);
+                    Object sparseValue = rune_sparse_json.get(sparseType);
+                    rune_sparse_data.put(sparseType, sparseValue.toString());
                 }
 
                 JSONArray skill_adj_json = (JSONArray) jsonObject.get("rune_skill_adj");