LibCore: remove redundant UDPSocket constructor

The comment claims it is for use from UDPServer::accept
Which is not a real function.

Libraries/LibCore/UDPSocket.cpp

@@ -34,16 +34,6 @@
 
 namespace Core {
 
-UDPSocket::UDPSocket(int fd, Object* parent)
-    : Socket(Socket::Type::UDP, parent)
-{
-    // NOTE: This constructor is used by UDPServer::accept(), so the socket is already connected.
-    m_connected = true;
-    set_fd(fd);
-    set_mode(IODevice::ReadWrite);
-    set_error(0);
-}
-
 UDPSocket::UDPSocket(Object* parent)
     : Socket(Socket::Type::UDP, parent)
 {

Libraries/LibCore/UDPSocket.h

@@ -36,7 +36,6 @@ public:
     virtual ~UDPSocket() override;
 
 private:
-    UDPSocket(int fd, Object* parent = nullptr);
     explicit UDPSocket(Object* parent = nullptr);
 };