driver: Highlight even after a widget returns non-zero

Closes zsh-users#90.

Author: phy1729

zsh-syntax-highlighting.zsh

@@ -284,7 +284,7 @@ _zsh_highlight_add_highlight()
 # $1 is name of widget to call
 _zsh_highlight_call_widget()
 {
-  builtin zle "$@" && 
+  builtin zle "$@"
   _zsh_highlight
 }