modules/cban: remove log announcements

-we don't need to know who (repeatedly) tries to join a CBAN'd channel.

Author: siniStar7

src/modules/m_cban.cpp

@@ -201,8 +201,6 @@ class ModuleCBan final
 		{
 			// Channel is banned.
 			user->WriteNumeric(ERR_BADCHANNEL, cname, INSP_FORMAT("Channel {} is CBANed: {}", cname, rl->reason));
-			ServerInstance->SNO.WriteGlobalSno('a', "{} tried to join {} which is CBANed ({})",
-				user->nick, cname, rl->reason);
 			return MOD_RES_DENY;
 		}