fixes tmux config -> tutorial was for pre 2.1, all my boxes are post 2.1

so they need to use the new configuration set

configs/tmux/tmux.conf

@@ -24,8 +24,5 @@ bind-key C-b send-prefix
 bind-key C-s send-prefix -2
 
 # enable the mouse.
-setw -g mouse-mode on
-set -g mouse-select-pane on
-set -g mouse-resize-pane on
-set -g mouse-select-window on
+setw -g mouse on