[FIX] web: BasicView: prevent crash in tests

A crash occured in several Studio tests that have just been
forwardported to saas-11.2, because of a line that hadn't been
adapted in rev. cb339842 (technically, the previous code was
correct, but it crashed when viewInfo.fields was undefined, which
doesn't happen outside the tests environment).

addons/web/static/src/js/views/basic/basic_view.js

@@ -45,7 +45,7 @@ var BasicView = AbstractView.extend({
         this.rendererParams.viewType = this.viewType;
 
         this.controllerParams.confirmOnDelete = true;
-        this.controllerParams.archiveEnabled = 'active' in viewInfo.fields;
+        this.controllerParams.archiveEnabled = 'active' in this.fields;
         this.controllerParams.hasButtons =
                 'action_buttons' in params ? params.action_buttons : true;