Codechange: use default dtor instead of empty (#10826)

src/network/core/core.h

@@ -48,7 +48,7 @@ public:
 	NetworkSocketHandler() { this->has_quit = false; }
 
 	/** Close the socket when destructing the socket handler */
-	virtual ~NetworkSocketHandler() {}
+	virtual ~NetworkSocketHandler() = default;
 
 	/**
 	 * Mark the connection as closed.

src/network/core/http.h

@@ -42,7 +42,7 @@ struct HTTPCallback {
 	virtual bool IsCancelled() const = 0;
 
 	/** Silentium */
-	virtual ~HTTPCallback() {}
+	virtual ~HTTPCallback() = default;
 };
 
 /** Base socket handler for HTTP traffic. */

src/network/core/tcp_game.h

@@ -518,7 +518,7 @@ public:
 	 * @param status The reason the connection got closed.
 	 */
 	virtual NetworkRecvStatus CloseConnection(NetworkRecvStatus status) = 0;
-	virtual ~NetworkGameSocketHandler() {}
+	virtual ~NetworkGameSocketHandler() = default;
 
 	/**
 	 * Sets the client info for this socket handler.

src/network/network_content.h

@@ -57,7 +57,7 @@ struct ContentCallback {
 	virtual void OnDownloadComplete(ContentID cid) {}
 
 	/** Silentium */
-	virtual ~ContentCallback() {}
+	virtual ~ContentCallback() = default;
 };
 
 /**

src/network/network_gui.cpp

@@ -1444,7 +1444,7 @@ public:
 		this->height = d.height + WidgetDimensions::scaled.framerect.Vertical();
 		this->width = d.width + WidgetDimensions::scaled.framerect.Horizontal();
 	}
-	virtual ~ButtonCommon() {}
+	virtual ~ButtonCommon() = default;
 
 	/**
 	 * OnClick handler for when the button is pressed.

src/network/network_udp.cpp

@@ -70,7 +70,7 @@ public:
 	 * @param addresses The addresses to bind on.
 	 */
 	ServerNetworkUDPSocketHandler(NetworkAddressList *addresses) : NetworkUDPSocketHandler(addresses) {}
-	virtual ~ServerNetworkUDPSocketHandler() {}
+	virtual ~ServerNetworkUDPSocketHandler() = default;
 };
 
 void ServerNetworkUDPSocketHandler::Receive_CLIENT_FIND_SERVER(Packet *p, NetworkAddress *client_addr)
@@ -88,7 +88,7 @@ class ClientNetworkUDPSocketHandler : public NetworkUDPSocketHandler {
 protected:
 	void Receive_SERVER_RESPONSE(Packet *p, NetworkAddress *client_addr) override;
 public:
-	virtual ~ClientNetworkUDPSocketHandler() {}
+	virtual ~ClientNetworkUDPSocketHandler() = default;
 };
 
 void ClientNetworkUDPSocketHandler::Receive_SERVER_RESPONSE(Packet *p, NetworkAddress *client_addr)