Remove -feefilter option

Feefilter option is debug only and it isn't used in any tests, it's wasteful
to check this option for every peer on every iteration of the message handler
loop. refs #21545

src/net_processing.cpp

@@ -4711,7 +4711,6 @@ bool PeerManagerImpl::SendMessages(CNode* pto)
         if (pto->m_tx_relay != nullptr &&
             !m_ignore_incoming_txs &&
             pto->GetCommonVersion() >= FEEFILTER_VERSION &&
-            gArgs.GetBoolArg("-feefilter", DEFAULT_FEEFILTER) &&
             !pto->HasPermission(NetPermissionFlags::ForceRelay) // peers with the forcerelay permission should not filter txs to us
         ) {
             CAmount currentFilter = m_mempool.GetMinFee(gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000).GetFeePerK();