'main': Don't highlight in vared
'main': Don't highlight in vared

This is a continuation of 451665cb2a8ba80626aab295c88d23d0f341ea6c which did
the same for the $PS3 prompt.

Reported-by: Sebastian Gniazdowski

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