[quadrapassel] Prevent setting up timer when game has ended

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 729ef2f0e2fbf60f3843a6d014620bc08b3c40a3
Author: Tomi Leppänen <tomi leppanen telemail fi>
Date:   Mon Sep 19 22:05:51 2016 +0300

    Prevent setting up timer when game has ended
    
    Prevents drop timer from being set up when the game has ended. This
    prevents segfault when pause key is pressed twice after the game ended.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=771541

 src/game.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/game.vala b/src/game.vala
index a793388..4a6cb62 100644
--- a/src/game.vala
+++ b/src/game.vala
@@ -261,7 +261,7 @@ public class Game : Object
         set
         {
             _paused = value;
-            if (has_started)
+            if (has_started && !game_over)
                 setup_drop_timer ();
             pause_changed ();
         }