[FIX] web: list: multi edit boolean with ENTER

This rev. solves the similar issue as 801c603218, but with boolean
fields.

Scenario: select several records, select a boolean cell, press
enter to change the boolean value.

Task 2068280

addons/web/static/src/js/fields/basic_fields.js

@@ -884,6 +884,8 @@ var FieldBoolean = AbstractField.extend({
     _onKeydown: function (ev) {
         switch (ev.which) {
             case $.ui.keyCode.ENTER:
+                // prevent subsequent 'click' event (see _onKeydown of AbstractField)
+                ev.preventDefault();
                 this.$input.prop('checked', !this.value);
                 this._setValue(!this.value);
                 return;