[gnome-tetravex] Fix previous commit.

[Arnaud B. <arnaudb src gnome org>]

commit e6f5f8d9c515aeaf172aeda308b4cb25d0aad1b8
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Fri Sep 20 21:36:46 2019 +0200

    Fix previous commit.

 src/gnome-tetravex.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/gnome-tetravex.vala b/src/gnome-tetravex.vala
index a7a71e2..428f7b8 100644
--- a/src/gnome-tetravex.vala
+++ b/src/gnome-tetravex.vala
@@ -419,7 +419,7 @@ private class Tetravex : Gtk.Application
 
     private void new_game_cb ()
     {
-        if (puzzle.game_in_progress)
+        if (puzzle.game_in_progress && !puzzle.is_solved)
         {
             MessageDialog dialog = new MessageDialog (window,
                                                       DialogFlags.MODAL,