[gnome-klotski] Fix scores import

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 8c363bbac7d0a11335470248f9124f86eebf94dd
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Sun Feb 14 16:57:24 2016 -0600

    Fix scores import
    
    Broke this when switching away from integer category names

 src/klotski-window.vala |   20 ++++++++++++--------
 1 files changed, 12 insertions(+), 8 deletions(-)
---
diff --git a/src/klotski-window.vala b/src/klotski-window.vala
index 4013dc5..ebfc514 100644
--- a/src/klotski-window.vala
+++ b/src/klotski-window.vala
@@ -451,25 +451,29 @@ public class KlotskiWindow : ApplicationWindow
         {"start-game", start_puzzle_cb}
     };
 
+    private static string normalize_map_name (string name)
+    {
+        return name.down ().replace (" ", "-");
+    }
+
     class construct
     {
         score_categories = new Gee.ArrayList<Games.Scores.Category> ();
         for (var i = 0; i < levels.length; i++)
         {
-            score_categories.add (new Games.Scores.Category (levels[i].name.down ().replace (" ", "-"),
+            score_categories.add (new Games.Scores.Category (normalize_map_name (levels[i].name),
                                                              _(levels[i].name)));
         }
     }
 
     private Games.Scores.Category? category_request (string key)
     {
-        var i = int.parse (key);
-        // i will be 0 if parsing fails, but 0 is also a valid map key.
-        if (i == 0 && key != "0")
-            return null;
-        if (i < 0 || i > score_categories.size)
-            return null;
-        return score_categories[i];
+        for (int i = 0; i < levels.length; i++)
+        {
+            if (key == normalize_map_name (levels[i].name))
+                return score_categories[i];
+        }
+        return null;
     }
 
     private void parse_old_score (string line, out Games.Scores.Score? score, out Games.Scores.Category? 
category)