Fix random search;default-search.Then I can see 5 search results Web UI ftests

Error Message
AssertionError: expected '6' to equal '5'
Stacktrace
AssertionError: expected '6' to equal '5'
    at World.<anonymous> (/opt/jenkins/workspace/master/plugins_nuxeo-web-ui-master-master/ftest/web-ui/webdriver/node_modules/@nuxeo/nuxeo-web-ui-ftest/test/features/step_definitions/search.js:86:67)
    at new Promise (/opt/jenkins/workspace/master/plugins_nuxeo-web-ui-master-master/ftest/web-ui/webdriver/node_modules/core-js/library/modules/es6.promise.js:177:7)