Fix attribute 'hide-content-view-actions' of element 'nuxeo-results'

Adding attribute hide-content-view-actions to an element nuxeo-results does not hide the content view actions div.

        <nuxeo-results id="results"
                     name="[[document.uid]]"
                     nx-provider="provider"
                     document="[[document]]"
                     hide-content-view-actions > 

nuxeo-results element uses hidden$ attribute on the div, I am told it is considered bad practice, and does not work because the parent uses display: flex.