tmux: fix rotation direction

This is more intuitive, given the position of the `i` and `o` keys on
the keyboard:

  - C-o: rotates clockwise
  - C-i: rotates counter-clockwise

config/tmux/tmux.conf

@@ -46,8 +46,8 @@ bind -r >       swap-window -d -t :+
 bind -r <       swap-window -d -t :-
 
 # Choosing layouts
-bind -r C-o     rotate-window
-bind -r C-i     rotate-window -D
+bind -r C-o     rotate-window -D
+bind -r C-i     rotate-window -U
 
 bind -r space   next-layout
 bind    C-m     set main-pane-width 50% \; select-layout main-vertical