structured-haskell-mode: fix location of the "site-lisp" symlink

pkgs/development/haskell-modules/configuration-common.nix

@@ -610,9 +610,9 @@ self: super: {
     # cannot easily byte-compile these files, unfortunately, because they
     # depend on a new version of haskell-mode that we don't have yet.
     postInstall = ''
-      local lispdir=( "$out/share/"*"-${self.ghc.name}/${drv.pname}-"*"/elisp" )
-      mkdir -p $out/share/emacs
-      ln -s $lispdir $out/share/emacs/site-lisp
+      local lispdir=( "$data/share/${self.ghc.name}/"*"/${drv.pname}-"*"/elisp" )
+      mkdir -p $data/share/emacs
+      ln -s $lispdir $data/share/emacs/site-lisp
     '';
   })).override {
     haskell-src-exts = self.haskell-src-exts_1_19_1;