Removed `lts` update check flag
Removed `lts` update check flag

no issue

- `lts` parameter support was discontinued as of today. Returned data completely relies on `ghost_version` sent with the update check request

TryGhost/Ghost,kevinansfield/Ghost,TryGhost/Ghost,JohnONolan/Ghost,kevinansfield/Ghost,bitjson/Ghost,JohnONolan/Ghost,e10/Ghost,e10/Ghost,bitjson/Ghost,janvt/Ghost,ErisDS/Ghost,Kikobeats/Ghost,Kikobeats/Ghost,ErisDS/Ghost,Kikobeats/Ghost,janvt/Ghost,kevinansfield/Ghost,JohnONolan/Ghost,ErisDS/Ghost,TryGhost/Ghost