Fix bug where user's selected session was not saved after exiting the greeter

themes/default/js/greeter.js

@@ -703,7 +703,7 @@ class Theme {
 	 * Greeter to log them in with the session they selected.
 	 */
 	authentication_complete() {
-		let selected_session = $( '.selected' ).attr( 'data-session-id' ),
+		let selected_session = $( '#session-list .selected' ).attr( 'data-session-id' ),
 			err_msg          = _config.translations.auth_failed;
 
 		this.auth_pending = false;