do not use screen

with the latest webview, websocket isn't closed in the background, so we
don't need to use screen to keep session. we might need to revisit this
if the issue happens again

Bug: 363900914
Test: launch app, go to the launcher, wait and then resume the app
Change-Id: If3943aa712ab7febd89d19e831887dbdfc97117d
diff --git a/build/debian/fai_config/files/etc/systemd/system/ttyd.service/AVF b/build/debian/fai_config/files/etc/systemd/system/ttyd.service/AVF
index 0aab770..5c7ff9c 100644
--- a/build/debian/fai_config/files/etc/systemd/system/ttyd.service/AVF
+++ b/build/debian/fai_config/files/etc/systemd/system/ttyd.service/AVF
@@ -3,7 +3,7 @@
 After=syslog.target
 After=network.target
 [Service]
-ExecStart=/usr/local/bin/ttyd --ssl --ssl-cert /etc/ttyd/server.crt --ssl-key /etc/ttyd/server.key --ssl-ca /etc/ttyd/ca.crt -W screen -aAxR -S main login -f droid
+ExecStart=/usr/local/bin/ttyd --ssl --ssl-cert /etc/ttyd/server.crt --ssl-key /etc/ttyd/server.key --ssl-ca /etc/ttyd/ca.crt -W login -f droid
 Type=simple
 Restart=always
 User=root