Revert ""expand" specifies "-b"."

No idea what this was supposed to do, there's no mention of
any -b option anywhere that I can find.

This reverts commit f23b0db4df.

elisp/ghc-info.el

@@ -127,7 +127,7 @@
 (defun ghc-expand-th ()
   (interactive)
   (let* ((file (buffer-file-name))
-	 (cmds (list "expand" file "-b" "\n"))
+	 (cmds (list "expand" file))
 	 (source (ghc-run-ghc-mod cmds)))
     (when source
       (ghc-display