LibWeb: Add support for indexed setter of HTMLOptionsCollection

Author: https://github.com/vpzomtrrfrt
Commit: 99824eae14
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/630
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/tcl3 ✅

Userland/Libraries/LibWeb/HTML/HTMLOptionsCollection.h

@@ -24,6 +24,8 @@ public:
     [[nodiscard]] static JS::NonnullGCPtr<HTMLOptionsCollection> create(DOM::ParentNode& root, ESCAPING Function<bool(DOM::Element const&)> filter);
     virtual ~HTMLOptionsCollection() override;
 
+    WebIDL::ExceptionOr<void> set_value_of_indexed_property(u32, JS::Value) override;
+
     WebIDL::ExceptionOr<void> set_length(WebIDL::UnsignedLong);
 
     WebIDL::ExceptionOr<void> add(HTMLOptionOrOptGroupElement element, Optional<HTMLElementOrElementIndex> before = {});