Updated language extensions variable name.

Author: lukehoersten

snippets/haskell-mode/lang-pragma

@@ -5,5 +5,5 @@
 # contributor: Luke Hoersten <luke@hoersten.org>
 # --
 {-# LANGUAGE `(some #'(lambda (fn)
-                        (funcall fn "Extension: " haskell-ghc-supported-languages))
+                        (funcall fn "Extension: " haskell-ghc-supported-extensions))
                     yas-prompt-functions)` #-}