[FIX] website: prevent faulty 'no access' message for analytics

There are multiple scopes giving access to analytics api, like
https://www.googleapis.com/auth/analytics.readonly

Having a space at the end of the queried string prevents correct
scope detection; so a user who has, in fact, access will receive
a faulty error message.

addons/website/static/src/js/website.backendDashboard.js

@@ -257,7 +257,7 @@ var Dashboard = Widget.extend(ControlPanelMixin, {
         // Check if the user is authenticated and has the right to make API calls
         if (!gapi.analytics.auth.getAuthResponse()) {
             this.display_unauthorized_message($analytics_components, 'not_connected');
-        } else if (gapi.analytics.auth.getAuthResponse() && gapi.analytics.auth.getAuthResponse().scope.indexOf('https://www.googleapis.com/auth/analytics ') === -1) {
+        } else if (gapi.analytics.auth.getAuthResponse() && gapi.analytics.auth.getAuthResponse().scope.indexOf('https://www.googleapis.com/auth/analytics') === -1) {
             this.display_unauthorized_message($analytics_components, 'no_right');
         } else {
             this.make_analytics_calls($analytics_components);