reconnect: remember Site Manager entry

[robertg]

When using "reconnect" (Ctrl-R) after starting FileZilla it would be great if FZ rememberred not only the connection IP and local and remote directory but also the "session", i. e. the Site Manager entry it was started from - with all its settings like "Use synchronized browsing".
Otherwise, if synchronized browsing is useful for this site (I guess as it is for most websites), using reconnect makes no sense.
I always have to go to the Site Manager to start the session instead of using "Reconnect".

This ticket is some similar to ticket #4746, but there it is about remembering settings made interactively. Maybe it's easyier to implement remembering only Site Manager entry.