remove createFile legacy alias from vars/interface

it's hard to filter this out in nix. So instead we just drop this
option.

nixosModules/clanCore/vars/default.nix

@@ -43,9 +43,8 @@ in
             validationHash
             migrateFact
             share
+            prompts
             ;
-          # createFile is deprecated.
-          prompts = (lib.removeAttrs generator.prompts [ "createFile" ]);
 
           files = lib.flip lib.mapAttrs generator.files (
             _name: file: {

nixosModules/clanCore/vars/interface.nix

@@ -259,9 +259,6 @@ in
               default = { };
               type = attrsOf (
                 submodule (prompt: {
-                  imports = [
-                    (lib.mkRenamedOptionModule [ "createFile" ] [ "persist" ])
-                  ];
                   options = {
                     name = lib.mkOption {
                       description = ''