LibWeb/HTML: Update get_an_elements_target() to current spec

Author: https://github.com/AtkinsSJ
Commit: 9254994687
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3402
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/shannonbooth
Reviewed-by: https://github.com/tcl3 ✅

Libraries/LibWeb/HTML/HTMLAreaElement.h

@@ -44,9 +44,9 @@ private:
     {
         queue_an_element_task(source, move(steps));
     }
-    virtual String hyperlink_element_utils_get_an_elements_target() const override
+    virtual String hyperlink_element_utils_get_an_elements_target(Optional<String> target) const override
     {
-        return get_an_elements_target();
+        return get_an_elements_target(target);
     }
     virtual TokenizedFeature::NoOpener hyperlink_element_utils_get_an_elements_noopener(StringView target) const override
     {