[vim] Fix escape of backslash in s:shortpath
[vim] Fix escape of backslash in s:shortpath

Close #1000

janlazo/fzf,wilywampa/fzf,junegunn/fzf,junegunn/fzf,infokiller/fzf,infokiller/fzf,infokiller/fzf,junegunn/fzf,stuha/wbr-zsh,wilywampa/fzf,wilywampa/fzf,janlazo/fzf,janlazo/fzf