Revert "Fix a typo."

This reverts commit 0fcfeb96770954dde8ce668f1d3abc1881953cbf.
Revert "Make inspector use `slime-inspector-value-face' like it did in the past."

This reverts commit 81b6578178dc25b6d52079e11732db586aa82c28.
Interactive slots in the inspector are not "real" presentations by default

In commit 6af818, the inspector started using real presentations
whenever slime-presentations.el was loaded. Among other things, this
changed the face of the slots. This commit brings legacy behaviour
back. If you want presentations in the inspector, add

(eval-after-load 'slime-presnetations
  '(setq slime-inspector-insert-ispec-function
         'slime-presentation-inspector-insert-ispec))

to your init file

* contrib/slime-presentations.el: Don't set
`slime-inspector-insert-ispec-function' by default, it makes the
blue slots in the inspector go away which some users were used to.