Get rid of non ascii character in source file.

There was a ß in utils.py that I think was supposed to be a 0.  Either it needs
to be changed to a 0 or the character encoding needs to be declared at the top
of the source file.  I opted to change the character to a 0.
Signed-off-by: NMike O'Connor <stew@vireo.org>

daklib/utils.py

@@ -1236,7 +1236,7 @@ used."""
         args = keywords["EXPKEYSIG"]
         if len(args) >= 1:
             key = args[0]
-        reject("Signature made by expired key x%s" % (key))
+        reject("Signature made by expired key 0x%s" % (key))
         bad = 1
     if keywords.has_key("KEYEXPIRED") and not keywords.has_key("GOODSIG"):
         args = keywords["KEYEXPIRED"]