[FIX] web: add missing utils dependency

Since bb37077610 (apparently), trying to regenerate the assets through the
crash manager result in a traceback.

Indeed, utils was not defined.

closes odoo/odoo#38129

Signed-off-by: Jérémy Kersten (jke) <jke@openerp.com>

addons/web/static/src/js/tools/debug_manager.js

@@ -3,6 +3,7 @@ odoo.define('web.DebugManager', function (require) {
 
 var core = require('web.core');
 var session = require('web.session');
+var utils = require('web.utils');
 var Widget = require('web.Widget');
 
 var QWeb = core.qweb;