Treat sessions that are there when we log in as old

Use the bulk 'review' toast for sessions that existed at the time
of login, rather than considering them all to be new.

Also cheeky unrelated proptypes fix.

Fixes https://github.com/vector-im/riot-web/issues/13443
Requires https://github.com/matrix-org/matrix-js-sdk/pull/1360

src/components/views/toasts/UnverifiedSessionToast.js

@@ -27,7 +27,7 @@ import { replaceableComponent } from '../../../utils/replaceableComponent';
 @replaceableComponent("views.toasts.UnverifiedSessionToast")
 export default class UnverifiedSessionToast extends React.PureComponent {
     static propTypes = {
-        deviceId: PropTypes.object,
+        deviceId: PropTypes.string,
     }
 
     _onLaterClick = () => {