'main': Path separators: Leave styles empty by default
'main': Path separators: Leave styles empty by default

If the separator feature is disabled, this makes it possible to
change the main 'path' styles in a running session without the
need to touch the '_pathseparator' styles, too.

psprint/zsh-syntax-highlighting,psprint/zsh-syntax-highlighting,phy1729/zsh-syntax-highlighting,danielshahaf/zsh-syntax-highlighting,stuha/wbr-zsh,danielshahaf/zsh-syntax-highlighting-debian,zsh-users/zsh-syntax-highlighting,zsh-users/zsh-syntax-highlighting,joshuarubin/dotfiles,m0vie/zsh-syntax-highlighting,joshuarubin/dotfiles,x-way/zsh-syntax-highlighting,danielshahaf/zsh-syntax-highlighting-debian,m0vie/zsh-syntax-highlighting,phy1729/zsh-syntax-highlighting,P71/zsh-syntax-highlighting,joshuarubin/dotfiles,danielshahaf/zsh-syntax-highlighting,x-way/zsh-syntax-highlighting,P71/zsh-syntax-highlighting,joshuarubin/dotfiles