sort: Avoid unnecessary copies when hashing Line objects

Author: https://github.com/tcl3
Commit: 1b1f27bdfb
Pull-request: https://github.com/SerenityOS/serenity/pull/17930
Reviewed-by: https://github.com/gmta
Reviewed-by: https://github.com/timschumi ✅

Userland/Utilities/sort.cpp

@@ -42,7 +42,7 @@ private:
 
 template<>
 struct AK::Traits<Line> : public DefaultTraits<Line> {
-    static unsigned hash(Line l)
+    static unsigned hash(Line const& l)
     {
         if (l.numeric)
             return l.numeric_key;