Discontinue use of reserved keybinding for haskell-cabal-visit-file

Fixes #1583

Author: purcell

haskell.el

@@ -44,7 +44,7 @@
     (define-key map (kbd "M-.") 'haskell-mode-jump-to-def-or-tag)
     (define-key map (kbd "C-c C-k") 'haskell-interactive-mode-clear)
     (define-key map (kbd "C-c C-c") 'haskell-process-cabal-build)
-    (define-key map (kbd "C-c v c") 'haskell-cabal-visit-file)
+    (define-key map (kbd "C-c C-v") 'haskell-cabal-visit-file)
     (define-key map (kbd "C-c C-x") 'haskell-process-cabal)
     (define-key map (kbd "C-c C-b") 'haskell-interactive-switch)
     (define-key map (kbd "C-c C-z") 'haskell-interactive-switch)