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/WebSockets/WebSocket.cpp

@@ -100,9 +100,7 @@ WebSocket::WebSocket(HTML::Window& window, AK::URL& url)
     };
 }
 
-WebSocket::~WebSocket()
-{
-}
+WebSocket::~WebSocket() = default;
 
 // https://websockets.spec.whatwg.org/#dom-websocket-readystate
 WebSocket::ReadyState WebSocket::ready_state() const