Client sessions change dimensions of host terminal.

[m0sth8]

Hi, thank you for the great project.

I noticed that client sessions, including read-only sessions, affect dimensions of host terminal. (https://github.com/owenthereal/upterm/blob/master/host/internal/server.go#L253) In my case it shouldn't be like that but I wonder if it's something that's expected by other use cases. (e.g. tmux based sessions).