LibWeb: Add legacy Option factory function

Author: https://github.com/Igoorx
Commit: 8da99c3014
Pull-request: https://github.com/SerenityOS/serenity/pull/13499
Reviewed-by: https://github.com/linusg

Userland/Libraries/LibWeb/Forward.h

@@ -501,6 +501,7 @@ class NodeFilterWrapper;
 class NodeIteratorWrapper;
 class NodeListWrapper;
 class NodeWrapper;
+class OptionConstructor;
 class PageTransitionEventWrapper;
 class PerformanceTimingWrapper;
 class PerformanceWrapper;