Handle case when user has revoked osm token

[kamicut]

When the user authenticates to the app using their OSM credentials, we save their login in a session with hydra using remember_for:

osm-teams/app/lib/osm.js

Lines 80 to 87 in 381dee5

	redirect: function (url, status) { res.redirect(url) },
	success: function (user) {
	if (challenge) {
	hydra.acceptLoginRequest(challenge, {
	subject: user.id,
	remember: true,
	remember_for: 9999
	}).then(response => {

When a new login request comes in, we check if we can skip the login in

osm-teams/app/oauth/login.js

Lines 19 to 22 in 381dee5

	if (skip) {
	const { redirect_to } = await hydra.acceptLoginRequest(challenge, { subject })
	res.redirect(redirect_to)
	} else {

However we need to check if the user token is still valid before skipping.