Don't label transactions "Open" while catching up

Since the default `nSequence` is `0xFFFFFFFE` and locktime is enabled,
the checking `wtx.is_final` is meaningless until the syncing has
completed.

src/interfaces/wallet.h

@@ -178,7 +178,8 @@ public:
     //! Try to get updated status for a particular transaction, if possible without blocking.
     virtual bool tryGetTxStatus(const uint256& txid,
         WalletTxStatus& tx_status,
-        int& num_blocks) = 0;
+        int& num_blocks,
+        int64_t& block_time) = 0;
 
     //! Get transaction details.
     virtual WalletTx getWalletTxDetails(const uint256& txid,