haskell-c2hs.el: don't quote face inside a list

A face is represented by a symbol, however representing a symbol
inside lists requires no quoting. So remove the quote.

Fixes warning:

    haskell-c2hs.el:37:19: Error: in defface for ‘haskell-c2hs-hook-pair-face’: Value for face attribute ‘:inherit’ should not be quoted

Author: Hi-Angel

haskell-c2hs.el

@@ -34,12 +34,12 @@
 (add-to-list 'auto-mode-alist '("\\.chs\\'" . haskell-c2hs-mode))
 
 (defface haskell-c2hs-hook-pair-face
-  '((t (:inherit 'font-lock-preprocessor-face)))
+  '((t (:inherit font-lock-preprocessor-face)))
   "Face for highlighting {#...#} pairs."
   :group 'haskell)
 
 (defface haskell-c2hs-hook-name-face
-  '((t (:inherit 'font-lock-keyword-face)))
+  '((t (:inherit font-lock-keyword-face)))
   "Face for highlighting c2hs hook names."
   :group 'haskell)