[pitivi] titleeditor: Fix color setting post Python3 port

[Thibault Saunier <tsaunier src gnome org>]

commit 1b7a645d854cccc5f942f943f7688143fe262153
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Mon Apr 14 22:43:38 2014 +0200

    titleeditor: Fix color setting post Python3 port

 pitivi/titleeditor.py |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)
---
diff --git a/pitivi/titleeditor.py b/pitivi/titleeditor.py
index 6e0a6ed..195fb6d 100644
--- a/pitivi/titleeditor.py
+++ b/pitivi/titleeditor.py
@@ -427,11 +427,13 @@ class PangoBuffer(Gtk.TextBuffer):
         return Gdk.Color(pc.red, pc.green, pc.blue)
 
     def color_to_hex(self, color):
+        """
+        @type color: L{Gdk.Color}
+        """
         hexstring = ""
         for col in 'red', 'green', 'blue':
-            hexfrag = hex(getattr(color, col) / (16 * 16)).split("x")[1]
-            if len(hexfrag) < 2:
-                hexfrag = "0" + hexfrag
+            channel = int(getattr(color, col))
+            hexfrag = "%02x" % (channel / 256)
             hexstring += hexfrag
         return hexstring