sessions: stop validating against hash of user agent because chromium is sending

different agent headers for whatever reason, example:

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML,
like Gecko) Chrome/88.0.4324.192 Safari/537.36

Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like
Gecko) Chrome/88.0.4324.104 Safari/537.36

seems to be related, at least, to App.postOpenWindow() hack.