added special list item for tracking trades in trade details screen

lib/src/screens/trade_details/track_trade_list_item.dart

@@ -0,0 +1,8 @@
+import 'package:cake_wallet/src/widgets/standart_list_row.dart';
+import 'package:flutter/material.dart';
+
+class TrackTradeListItem extends StandartListRow {
+  TrackTradeListItem({String title, String value, this.onTap})
+      : super(title: title, value: value);
+  final Function() onTap;
+}