[FIX] web: tests: correctly destroy view

addons/web/static/tests/fields/basic_fields_tests.js

@@ -1241,6 +1241,8 @@ QUnit.module('basic_fields', {
         // Copying from a div tag with white-space:pre-wrap doesn't work in Firefox
         assert.strictEqual(form.$('[name="txt"]').prop("tagName").toLowerCase(), 'span',
             "the field contents should be surrounded by a span tag");
+
+        form.destroy();
     });
 
     QUnit.module('FieldBinary');