CoreCore/NetworkIO: Fix disconnect when canceling character creation

Remove the filter on CMSG_CHAR_ENUM added in 59b4c34924 since the same opcode is already throttled in the new improved system. DoS attacks using this opcode are still mitigated with same effect of before.
Fixes #10915

src/server/game/Server/WorldSession.cpp

@@ -569,7 +569,6 @@ void WorldSession::LogoutPlayer(bool save)
     m_playerLogout = false;
     m_playerSave = false;
     m_playerRecentlyLogout = true;
-    AntiDOS.AllowOpcode(CMSG_CHAR_ENUM, true);
     LogoutRequest(0);
 }