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/Layout/RadioButton.cpp

@@ -18,9 +18,7 @@ RadioButton::RadioButton(DOM::Document& document, HTML::HTMLInputElement& elemen
     set_intrinsic_height(12);
 }
 
-RadioButton::~RadioButton()
-{
-}
+RadioButton::~RadioButton() = default;
 
 RefPtr<Painting::Paintable> RadioButton::create_paintable() const
 {