Remove use of GetTransactionAncestry in wallet code

This commit does not change behavior.

src/interfaces/chain.cpp

@@ -196,6 +196,10 @@ public:
         auto it_mp = ::mempool.mapTx.find(txid);
         return it_mp != ::mempool.mapTx.end() && it_mp->GetCountWithDescendants() > 1;
     }
+    void getTransactionAncestry(const uint256& txid, size_t& ancestors, size_t& descendants) override
+    {
+        ::mempool.GetTransactionAncestry(txid, ancestors, descendants);
+    }
 };
 
 } // namespace