Merge #5850

5850: Send serverinfo when client joins r=heinrich5991 a=def-

for GER3

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## Checklist

- [ ] Tested the change ingame
- [ ] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test (especially base/) or added coverage to integration test
- [ ] Considered possible null pointers and out of bounds array indexing
- [ ] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)


Co-authored-by: def <dennis@felsin9.de>

src/engine/server/server.cpp

@@ -1538,7 +1538,11 @@ void CServer::ProcessClientPacket(CNetChunk *pPacket)
 				str_format(aBuf, sizeof(aBuf), "player has entered the game. ClientID=%d addr=<{%s}> sixup=%d", ClientID, aAddrStr, IsSixup(ClientID));
 				Console()->Print(IConsole::OUTPUT_LEVEL_STANDARD, "server", aBuf);
 				m_aClients[ClientID].m_State = CClient::STATE_INGAME;
-				if(IsSixup(ClientID))
+				if(!IsSixup(ClientID))
+				{
+					SendServerInfo(m_NetServer.ClientAddr(ClientID), -1, SERVERINFO_EXTENDED, false);
+				}
+				else
 				{
 					CMsgPacker Msgp(4, true, true); //NETMSG_SERVERINFO //TODO: Import the shared protocol from 7 aswell
 					GetServerInfoSixup(&Msgp, -1, false);