~/.tmux.conf: keep old "default-path" behaviour.

.tmux.conf

set -g status off
bind-key f set -g status
bind-key c neww -c "#{pane_current_path}"
bind-key -n F1 select-window -t 0
bind-key -n F2 select-window -t 1
bind-key -n F3 select-window -t 2