fix(tmux): delay send-keys call
fix(tmux): delay send-keys call

Seems that under v3, if we send-keys too soon, we see this error:

    no current client

But if we delay it until after the first split, everything works.

wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent