Fix build break in TransactionBaseImpl::TrackKey (#5771)

Summary:
Fix build broken in https://github.com/facebook/rocksdb/pull/5696.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5771

Differential Revision: D17217665

Pulled By: lth

fbshipit-source-id: 7aa84a2a9b4feb7a3ab1cab174e09276430fe042

utilities/transactions/transaction_base.cc

@@ -646,7 +646,7 @@ void TransactionBaseImpl::TrackKey(TransactionKeyMap* key_map, uint32_t cfh_id,
 #else
   auto iter = cf_key_map.find(key);
   if (iter == cf_key_map.end()) {
-    auto result = cf_key_map.emplace(key, seq);
+    auto result = cf_key_map.emplace(key, TransactionKeyMapInfo(seq));
     iter = result.first;
   } else if (seq < iter->second.seq) {
     // Now tracking this key with an earlier sequence number