LibWeb: Port HTMLElement innerText/outerText to UTF-16

Author: https://github.com/trflynn89
Commit: 8600925713
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5627
Reviewed-by: https://github.com/gmta ✅

Libraries/LibWeb/WebDriver/ElementReference.cpp

@@ -523,7 +523,7 @@ String element_rendered_text(DOM::Node& node)
         return node.text_content().value_or({}).to_utf8_but_should_be_ported_to_utf16();
 
     auto& element = static_cast<HTML::HTMLElement&>(node);
-    return element.inner_text();
+    return element.inner_text().to_utf8_but_should_be_ported_to_utf16();
 }
 
 // https://w3c.github.io/webdriver/#dfn-center-point