Windows: Add SeasonFinishWindow

Elwig/Windows/MainWindow.xaml.cs

@@ -52,8 +52,8 @@ namespace Elwig.Windows {
             w.Show();
         }
 
-        private void PaymentWindowButton_Click(object sender, RoutedEventArgs e) {
-            var w = new ChartWindow();
+        private void SeasonFinishButton_Click(object sender, RoutedEventArgs e) {
+            var w = new SeasonFinishWindow();
             w.Show();
         }
     }