[Developers] Bug: mutating method sent to immutable object

[Tom Fuks]

In 'Preferences' pane, when editing settings of a tunnel restored from
standardUserDefaults, nothing changed but related GUI component gets
confused and an exception shows up in console.log:

  SSHKeychain[1702] Exception raised during posting of notification.
 Ignored.  exception: *** -[NSCFDictionary setObject:forKey:]:
  mutating method sent to immutable object


This has been observed on branch/0.8.2 and trunk.  See proposed patch
attached.

Cheers,

Tom
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