Allow Kindle serial numbers to have spaces, allowing copy/paste from Amazon web site (thanks to jakemarsden)

dedrm_src/config.py

@@ -879,7 +879,7 @@ class AddSerialDialog(QDialog):
 
     @property
     def key_value(self):
-        return unicode(self.key_ledit.text()).strip()
+        return unicode(self.key_ledit.text()).replace(' ', '')
 
     def accept(self):
         if len(self.key_name) == 0 or self.key_name.isspace():