refactor the dirsSubModule type so that we don't reference 'config.sane.persist' while creating options

modules/persist/default.nix

@@ -81,20 +81,12 @@ let
     }
   ];
 
-  # this submodule creates one attr per store, so that the user can specify something like:
+
+  # attrset from { "${storeName}" = [ dirEntry ] }
+  # the user can specify something like:
   #   <option>.private.".cache/vim" = { mode = "0700"; };
   # to place ".cache/vim" into the private store and create with the appropriate mode
-  dirsSubModule = types.submodule {
-    options = mapAttrs (store: store-cfg: mkOption {
-      default = [];
-      type = types.listOf contextualizedDirOrShorthand;
-      description = let
-        suffix = if store-cfg.storeDescription != null then
-          ": ${store-cfg.storeDescription}"
-        else "";
-      in "directories to persist in ${store}${suffix}";
-    }) cfg.stores;
-  };
+  dirsSubModule = types.attrsOf (types.listOf contextualizedDirOrShorthand);
 
   dirsModule = types.submodule ({ config, ... }: {
     options = {