Libraries: Use default constructors/destructors in LibWeb

https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#cother-other-default-operation-rules

"The compiler is more likely to get the default semantics right and
you cannot implement these functions better than the compiler."

Userland/Libraries/LibWeb/HTML/HTMLHyperlinkElementUtils.cpp

@@ -10,9 +10,7 @@
 
 namespace Web::HTML {
 
-HTMLHyperlinkElementUtils::~HTMLHyperlinkElementUtils()
-{
-}
+HTMLHyperlinkElementUtils::~HTMLHyperlinkElementUtils() = default;
 
 // https://html.spec.whatwg.org/multipage/links.html#reinitialise-url
 void HTMLHyperlinkElementUtils::reinitialize_url() const