Remove tmux bindings for mouse scrolling
Remove tmux bindings for mouse scrolling

I've copied this binding from someone else config and I never
really knew what it does.

Since it uses the old bind syntax, it stopped working after I
upgraded tmux and the scrolling continued to work just fine,
so I'm removing the binding

davialexandre/dotfiles,davialexandre/dotfiles,davialexandre/dotfiles,davialexandre/dotfiles