fix package hooks for listings

src/HsH-classes.dtx

@@ -1089,8 +1089,8 @@ http://www.latex-project.org/lppl.txt
 %     \pkg{scrhack} package. We also pass some configurations to if if it gets loaded.
 %    \begin{macrocode}
 \RequirePackage{scrhack}
-\AddToHook{package/siunitx/before}{\RequirePackage{xcolor}}
-\AddToHook{package/siunitx/after}{
+\AddToHook{package/listings/before}{\RequirePackage{xcolor}}
+\AddToHook{package/listings/after}{
   \lstset{
     commentstyle=\color{gray},
     keywordstyle=\color{FireBrick}\bfseries,