Let compiler generate wxTCPServer ctor

There is no need to define it manually, leaving it as default is shorter
and more clear.

include/wx/sckipc.h

@@ -122,7 +122,7 @@ public:
     virtual wxConnectionBase *OnAcceptConnection(const wxString& topic) override;
 
 protected:
-    wxSocketServer *m_server;
+    wxSocketServer *m_server = nullptr;
 
 #ifdef __UNIX_LIKE__
     // the name of the file associated to the Unix domain socket, may be empty

src/common/sckipc.cpp

@@ -1139,11 +1139,7 @@ wxConnectionBase *wxTCPClient::OnMakeConnection()
 // wxTCPServer
 // --------------------------------------------------------------------------
 
-wxTCPServer::wxTCPServer()
-    : wxServerBase()
-{
-    m_server = nullptr;
-}
+wxTCPServer::wxTCPServer() = default;
 
 bool wxTCPServer::Create(const wxString& serverName)
 {