bug#12104: 24.1; customize-variable: Customize buffer does not hide standard settings

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Please write in English if possible, as the Emacs maintainers
usually do not have translators for other languages.

Please describe exactly what actions triggered the bug, and
the precise symptoms of the bug.  If you can, give a recipe
starting from `emacs -Q':

- emacs -Q
- M-x customize-variable RET blink-matching-delay RET

The Customize buffer shows the value of the option, whereas according
to the News it should starts out hidden because the value has not been
changed.

Anyway, I think that hiding the values of options betrays the 
expectations of
users, as no other application I know of does so.  At least, such hiding
should be configurable (I've found no option to change it).  Emacs already
detects and shows in the State field whether a variable has been changed or
not.

Thank you for your attention.

Regards
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