driver: Do not pass widget arguments to _zsh_highlight
driver: Do not pass widget arguments to _zsh_highlight

This avoids a bug in zsh 4.3.12 and prior which affects passing
arguments to an anonymous function.

zsh-users/zsh-syntax-highlighting,phy1729/zsh-syntax-highlighting,phy1729/zsh-syntax-highlighting,P71/zsh-syntax-highlighting,P71/zsh-syntax-highlighting,zsh-users/zsh-syntax-highlighting