[FIX] web: date warning

- Set the computer TZ so that it is UTC day + 1. For example, set to
  'Australia/Adelaide' and perform the tests after 3:00 pm
- Go to Account > Customers > Invoices
- Set the Invice Date to today in the TZ

You receive the warning 'This date is on the future...'

The comparison of a UTC date without time `currentDate` is inconsistent
with `moment()`, which is not UTC and has a time set.

After playing around with `.utc()` and `startOf('d')` with no luck, we
decided to give up the idea of making `getTZOffset()` enter the game and
simply compare the string formatted values.

opw-2093186

closes odoo/odoo#40984

X-original-commit: f9eec97c
Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>

addons/web/static/src/js/widgets/date_picker.js

@@ -207,7 +207,8 @@ var DateWidget = Widget.extend({
             this.$warning.attr('title', title);
             this.$input.after(this.$warning);
         }
-        if (currentDate && currentDate.isAfter(moment())) {
+        // Get rid of time and TZ crap for comparison
+        if (currentDate && currentDate.format('YYYY-MM-DD') > moment().format('YYYY-MM-DD')) {
             this.$warning.show();
         } else {
             this.$warning.hide();