Fix paper-typeahead version selected when importing nuxeo-ui-elements 2.4.x

nuxeo-ui-elements v2.4.x dependency on nuxeo/paper-typeahead currently picks a version that is missing paper-typeahead.html when imported using bower, causing the nuxeo-elements-tutorial to fail when importing nuxeo-path-suggestion.

Steps to Reproduce:

1. Follow the nuxeo-elements-tutorial for LTS 2019 up through the Add UI Elements section
2. Open the running Polymer app and observe the browser dev tools console

Expected behavior: no errors visible

Actual behavior: 404 error seen on attempting to import bower_components/paper-typeahead/paper-typeahead.html.

Note: import from nuxeo-ui-elements/bower.json currently resolves to nuxeo/paper-typeahead@0.60-nx.0, which is missing the html element.