Reuse the dateformat variable

Signed-off-by: XhmikosR <xhmikosr@gmail.com>

scripts/pi-hole/js/db_lists.js

@@ -21,7 +21,7 @@ $(function () {
     $("#querytime").daterangepicker(
     {
       timePicker: true, timePickerIncrement: 15,
-      locale: { format: "MMMM Do YYYY, HH:mm" },
+      locale: { format: dateformat },
       startDate: start__, endDate: end__,
       ranges: {
         "Today": [moment().startOf("day"), moment()],