Fixed #33784 -- Removed unnecessary format escaping in admin calendar…

… widget.

Replacements were added in fa0653c
where we created a callback function by concatenating strings. It's
unnecessary and since d638cdc.

django/contrib/admin/static/admin/js/admin/DateTimeShortcuts.js

@@ -387,13 +387,7 @@
             DateTimeShortcuts.calendars[num].drawNextMonth();
         },
         handleCalendarCallback: function(num) {
-            let format = get_format('DATE_INPUT_FORMATS')[0];
-            // the format needs to be escaped a little
-            format = format.replace('\\', '\\\\')
-                .replace('\r', '\\r')
-                .replace('\n', '\\n')
-                .replace('\t', '\\t')
-                .replace("'", "\\'");
+            const format = get_format('DATE_INPUT_FORMATS')[0];
             return function(y, m, d) {
                 DateTimeShortcuts.calendarInputs[num].value = new Date(y, m - 1, d).strftime(format);
                 DateTimeShortcuts.calendarInputs[num].focus();