[FIX] web: fix click_all in enterprise

During the fix of the click_all test in community in 0f2a500f0e,
I have overlooked that enterprise used this code and removed a bit too much.

Restore the start flag in enterprise.

closes odoo/odoo#41784

Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>

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

@@ -153,6 +153,7 @@ var AbstractWebClient = Widget.extend(ServiceProviderMixin, KeyboardNavigationMi
             }).then(function () {
                 // Listen to 'scroll' event and propagate it on main bus
                 self.action_manager.$el.on('scroll', core.bus.trigger.bind(core.bus, 'scroll'));
+                odoo.isReady = true;
                 core.bus.trigger('web_client_ready');
                 if (session.uid === 1) {
                     self.$el.addClass('o_is_superuser');