Rewrite `tmux-choose` script
Rewrite `tmux-choose` script

- Use `tm` instead of `tmux-attach-or-new`
- Don't show `mux` options that are already running
- Use `ensure-in-term` instead of `in-term` (allow running from term)

benizi/dotfiles,benizi/dotfiles,benizi/dotfiles,benizi/dotfiles,benizi/dotfiles,benizi/dotfiles,benizi/dotfiles,benizi/dotfiles