[gnome-mines] Fix new game button not working after winning

[Robert Roth <robertroth src gnome org>]

commit 1f058376d5d1ec63e0d225bccb4cede4c463ffb3
Author: Robert Roth <robert roth off gmail com>
Date:   Sun Oct 14 00:30:50 2018 +0300

    Fix new game button not working after winning

 src/gnome-mines.vala | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/gnome-mines.vala b/src/gnome-mines.vala
index 6c263d1..224a077 100644
--- a/src/gnome-mines.vala
+++ b/src/gnome-mines.vala
@@ -779,6 +779,7 @@ public class Mines : Gtk.Application
         replay_button.label = _("Play _Again");
         pause_action.set_enabled (false);
         replay_button.sensitive = true;
+        repeat_size_action.set_enabled (true);
         play_pause_button.hide ();
         high_scores_button.show ();
     }