Codechange: Remove ZeroedMemoryAllocator from network socket handlers. (#13377)

Prefer member default initialisation instead.

src/network/network_query.h

@@ -13,7 +13,7 @@
 #include "network_internal.h"
 
 /** Class for handling the client side of quering a game server. */
-class QueryNetworkGameSocketHandler : public ZeroedMemoryAllocator, public NetworkGameSocketHandler {
+class QueryNetworkGameSocketHandler : public NetworkGameSocketHandler {
 private:
 	static std::vector<std::unique_ptr<QueryNetworkGameSocketHandler>> queries; ///< Pending queries.
 	std::string connection_string; ///< Address we are connected to.