unlockDialog: Adjust date format

As per design feedback at FOSDEM, adjust the time format to
not have a comma, nor padding.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/872

js/ui/unlockDialog.js

@@ -43,7 +43,7 @@ class UnlockDialogClock extends St.BoxLayout {
         let date = new Date();
         /* Translators: This is a time format for a date in
            long format */
-        let dateFormat = Shell.util_translate_time_string(N_('%A, %B %d'));
+        let dateFormat = Shell.util_translate_time_string(N_('%A %B %-d'));
         this._date.text = date.toLocaleFormat(dateFormat);
     }