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.cpp

@@ -318,7 +318,8 @@ public:
     }
     bool tryGetTxStatus(const uint256& txid,
         interfaces::WalletTxStatus& tx_status,
-        int& num_blocks) override
+        int& num_blocks,
+        int64_t& block_time) override
     {
         auto locked_chain = m_wallet.chain().lock(true /* try_lock */);
         if (!locked_chain) {
@@ -333,6 +334,7 @@ public:
             return false;
         }
         num_blocks = ::chainActive.Height();
+        block_time = ::chainActive.Tip()->GetBlockTime();
         tx_status = MakeWalletTxStatus(*locked_chain, mi->second);
         return true;
     }

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,