fix (login): loader before redirection

When we have a single storage selected, we automatically redirect the
user to it as we don't need to wait for a user action. The thing is we
used to have this UI being shown with a button that didn't make sense.
Instead we want to show the loader when we reach those condition

public/assets/pages/connectpage/ctrl_form.js

@@ -174,6 +174,7 @@ export default async function(render) {
             if (Object.keys(p).length > 0) {
                 url += "&state=" + btoa(JSON.stringify(p));
             }
+            toggleLoader(true);
             location.href = url;
             return rxjs.EMPTY;
         }),