Merge bitcoin/bitcoin#24562: Remove unused feebumper code

fae5d06 Remove unused feebumper code (MarcoFalke)

Pull request description:

  This was accidentally added in commit 0ea47ba. Presumably due to a copy-paste error, as `CreateTransaction` already takes care of the rbf-signal.

ACKs for top commit:
  achow101:
    ACK fae5d06
  promag:
    Code review ACK fae5d06

Tree-SHA512: 81aaf9c6bd9a4e2ad1789880bd8f2191f0ae9ba0a02794aa5db523236ea7df1c0dca078563219d293c694373c0a63c5bf168a85443e86556453ae5439791a618

Author: fanquake

src/wallet/feebumper.cpp

@@ -233,12 +233,6 @@ Result CreateRateBumpTransaction(CWallet& wallet, const uint256& txid, const CCo
 
     // Write back transaction
     mtx = CMutableTransaction(*tx_new);
-    // Mark new tx not replaceable, if requested.
-    if (!coin_control.m_signal_bip125_rbf.value_or(wallet.m_signal_rbf)) {
-        for (auto& input : mtx.vin) {
-            if (input.nSequence < 0xfffffffe) input.nSequence = 0xfffffffe;
-        }
-    }
 
     return Result::OK;
 }