[FIX] search_filters: broke a thing in f1a85ba

As part of fixing the JS docs (docstrings & references & ...), the
various search filters were de-namespaced (aka
ExtendedSearchProposition.Integer = ... -> var Integer = ...).

This had the side-effect of making a `new Date` refer to the extended
search Date field instead of the global Date object, which went
unnoticed because *that* had been wrapped in a moment() call, and
moment() apparently doesn't mind being given garbage, but it would also
create an "unbound" and thus never destroyed widget.

Remove the `new Date`, calling moment directly has pretty much the same
effect, moment objects created from date objects just have an extra
field (a cache for the date object I guess).

closes odoo/odoo#30791

addons/web/static/src/js/chrome/search_filters.js

@@ -238,7 +238,7 @@ var DateTime = Field.extend({
     _create_new_widget: function (name) {
         this[name] = new (this._get_widget_class())(this);
         return this[name].appendTo(this.$el).then((function () {
-            this[name].setValue(moment(new Date()));
+            this[name].setValue(moment());
         }).bind(this));
     },
     _get_widget_class: function () {