Mobile site detection should not rely on Safari in user agent

Nasty. FWIW if anyone hits the same issue, here’s the workaround I added, which I guess has to stay then:

    // we need to force a user agent that is recognized by Discourse as mobile
    webView.evaluateJavaScript("navigator.userAgent") { [weak self] result, error in
        if let userAgent = result as? String, error == nil {
            self?.webView.customUserAgent = userAgent + " Mobile"
        }
    }