Revert "[MM-37984] Allow Desktop App to authenticate via external providers outside of the app on supported servers (#23795)" (#24039)

This reverts commit abdf4e58c3.

server/public/model/user.go

@@ -62,8 +62,6 @@ const (
 	UserLocaleMaxLength   = 5
 	UserTimezoneMaxRunes  = 256
 	UserRolesMaxLength    = 256
-
-	DesktopTokenTTL = time.Minute * 3
 )
 
 //msgp:tuple User