Update locale time format in print jobs

- Previously print jobs that are ongoing or printed within 24 hours
  displayed the printed time in a 12hr format.
- Not all language locales are in the 12hr format, so the fix is to
  remove that parameter and use the numeric locale format.

Before: https://screenshot.googleplex.com/B3Y9JiAp6ET
After: https://screenshot.googleplex.com/srMiTVBJT6G

Bug: 1106231
Change-Id: I4103e954b5b3b26b6eacc9b188366ee022e5e10b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2311616Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Jimmy Gong <jimmyxgong@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791015}

chromeos/components/print_management/resources/print_job_entry.js

@@ -318,7 +318,7 @@ Polymer({
     // |jsDate|'s date, display the 12hour time of the current date.
     if (isToday(jsDate)) {
       return jsDate.toLocaleTimeString(/*locales=*/undefined,
-        {hour12: true, hour: 'numeric', minute: 'numeric'});
+          {hour: 'numeric', minute: 'numeric'});
     }
     // Remove the day of the week from the date.
     return jsDate.toLocaleDateString(/*locales=*/undefined,