fix for nerdtree delimiter character
fix for nerdtree delimiter character

nerdtree started using the hidden character I was using to hide the
arrow characters in nerdtree. The reason for this change is documented
in https://github.com/scrooloose/nerdtree/issues/904

nicknisi/dotfiles,OctavianRotari/dotfiles,nicknisi/dotfiles,nicknisi/dotfiles,NerdPad/dotfiles,OctavianRotari/dotfiles