wallet: remove fUpdate argument from AddToWalletIfInvolvingMe

diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index f46c7428..409e0483 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -1201,7 +1201,7 @@ bool CWallet::LoadToWallet(const Txid& hash, const UpdateWalletTxFn& fill_wtx)
     return true;
 }
 
-bool CWallet::AddToWalletIfInvolvingMe(const CTransactionRef& ptx, const SyncTxState& state, bool fUpdate, bool rescanning_old_block)
+bool CWallet::AddToWalletIfInvolvingMe(const CTransactionRef& ptx, const SyncTxState& state, bool rescanning_old_block)
 {
     const CTransaction& tx = *ptx;
     {
@@ -1221,7 +1221,6 @@ bool CWallet::AddToWalletIfInvolvingMe(const CTransactionRef& ptx, const SyncTxS
         }
 
         bool fExisted = mapWallet.contains(tx.GetHash());
-        if (fExisted && !fUpdate) return false;
         if (fExisted || IsMine(tx) || IsFromMe(tx))
         {
             /* Check if any keys in the wallet keypool that were supposed to be unused
@@ -1415,7 +1414,7 @@ void CWallet::RecursiveUpdateTxState(WalletBatch* batch, const Txid& tx_hash, co
 
 bool CWallet::SyncTransaction(const CTransactionRef& ptx, const SyncTxState& state, bool rescanning_old_block)
 {
-    if (!AddToWalletIfInvolvingMe(ptx, state, /*fUpdate=*/true, rescanning_old_block))
+    if (!AddToWalletIfInvolvingMe(ptx, state, rescanning_old_block))
         return false; // Not one of ours
 
     // If a transaction changes 'conflicted' state, that changes the balance
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index 180668ad..48ebbf66 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -347,7 +347,6 @@ private:
      * block_hash.IsNull(), then wallet state is not updated in AddToWallet, but
      * notifications happen and cached balances are marked dirty.
      *
-     * If fUpdate is true, existing transactions will be updated.
      * TODO: One exception to this is that the abandoned state is cleared under the
      * assumption that any further notification of a transaction that was considered
      * abandoned is an indication that it is not safe to be considered abandoned.
@@ -357,7 +356,7 @@ private:
      * Should be called with rescanning_old_block set to true, if the transaction is
      * not discovered in real time, but during a rescan of old blocks.
      */
-    bool AddToWalletIfInvolvingMe(const CTransactionRef& tx, const SyncTxState& state, bool fUpdate, bool rescanning_old_block) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
+    bool AddToWalletIfInvolvingMe(const CTransactionRef& tx, const SyncTxState& state, bool rescanning_old_block) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
 
     /** Mark a transaction (and its in-wallet descendants) as conflicting with a particular block. */
     void MarkConflicted(const uint256& hashBlock, int conflicting_height, const Txid& hashTx);