Allow to disable identity providers in the app

This issue only needs to be tested in 1 device. Login in a site that allows disabling identity providers. In web as admin, select to disable all identity providers. Configure the site to have at least 2 identity providers (e.g. Google and Microsoft). In the app, click to add a new site, enter the site url and click Connect. Check that you don't see any identity provider in the credentials page. In web as admin, disable only 1 identity provider. In the app, connect to the site again. Check that you don't see the disabled provider, but you see the others.