persist: lift sane.persist.dirs.{home,sys} up one level

modules/home-manager/neovim.nix

@@ -3,7 +3,7 @@
 lib.mkIf config.sane.home-manager.enable
 {
   # private because there could be sensitive things in the swap
-  sane.persist.dirs.home.private = [ ".cache/vim-swap" ];
+  sane.persist.home.private = [ ".cache/vim-swap" ];
 
   home-manager.users.colin.programs.neovim = {
     # neovim: https://github.com/neovim/neovim

modules/home-manager/zsh/default.nix

@@ -2,7 +2,7 @@
 
 lib.mkIf config.sane.home-manager.enable
 {
-  sane.persist.dirs.home.plaintext = [
+  sane.persist.home.plaintext = [
     # we don't need to full zsh dir -- just the history file --
     # but zsh will sometimes backup the history file and we get fewer errors if we do proper mounts instead of symlinks.
     # TODO: should be private?