bug#12443: 24.2.50; Default values in the minibuffer prompt (fix inconsisntecy)

[Juri Linkov]

> There is another consequence from the commit de4f347901a.

Sorry, I meant “another case from another commit”.

> Is there a real need to duplicate the default value in read-file-name
> when the default value is already shown as initial input?
>
> For example, now after typing 'C-x 5 d' (dired-other-frame), the prompt
> becomes overly long with the duplicate long default value that now
> doesn't fit into the frame width:
>
>   Dired in other frame (directory) 
> [/very/long/path/with/lots/of/subdirectories/]: 
> /very/long/path/with/lots/of/subdirectories/
>
> Here the default value is in square brackets [...] because of my
> customized prompt " [%s]" for minibuffer-default-prompt-format.
> But with the default format " (default %s)" the prompt would be even longer.

Another case is just ‘C-x d’ (dired) - it displays the duplicate
directory name too: in the default value and the same in the initial input:

  Dired (directory) (default /tmp/foo/bar/): /tmp/foo/bar/