fix: wrong date fn usage in #10350

[andelf]

Wrong date fn usage introduced in #10350.

Error in dev mode:

Write file failed, please copy the changes to other editors in case of losing data.

Error: Error: Assert failed: (instance? goog.date.Date dt)
at Object.cljs_time$format$unparse [as unparse] (./js/cljs-runtime/cljs_time.format.js:686:8)
at Object.frontend$date$date__GT_file_name [as date__GT_file_name] (./js/cljs-runtime/frontend.date.js:235:25)
at Object.frontend$modules$file$core$transact_file_tx_if_not_exists_BANG_ [as transact_file_tx_if_not_exists_BANG_] (./js/cljs-runtime/frontend.modules.file.core.js:168:57)
at Object.frontend$modules$file$core$save_tree_BANG_ [as save_tree_BANG_] (./js/cljs-runtime/frontend.modules.file.core.js:245:35)
at Object.frontend$modules$outliner$file$do_write_file_BANG_ [as do_write_file_BANG_] (./js/cljs-runtime/frontend.modules.outliner.file.js:36:35)
at Object.frontend$modules$outliner$file$write_files_BANG_ [as write_files_BANG_] (./js/cljs-runtime/frontend.modules.outliner.file.js:97:36)
at eval (./js/cljs-runtime/frontend.modules.outliner.file.js:182:32)
at switch__27887__auto__ (./js/cljs-runtime/frontend.util.js:2224:122)
at eval (./js/cljs-runtime/frontend.util.js:2737:29)
at Function.frontend$util$state_machine__27888__auto____1 [as cljs$core$IFn$_invoke$arity$1] (./js/cljs-runtime/frontend.util.js:2759:4)

[Bad3r]

@andelf there seems to be an issue now when linking/creating pages with a date as a title.

for example add the following blocks to a page:

- [[2022-10-10]]
- [[2023-10-28]]
- [[2023_10_28]]

when clicking on any of these pages the result is an empty page
Recording - 29 Oct 2023.webm