fix: fix findBalanceByAddressAndBlock query

Refs cardano-foundation#206

cardano-rosetta-server/src/server/db/queries/blockchain-queries.ts

@@ -170,13 +170,16 @@ const findBalanceByAddressAndBlock = `SELECT (SELECT COALESCE(SUM(r.amount),0)
   JOIN stake_address ON 
     stake_address.id = r.addr_id AND 
     stake_address.view = $1
-  WHERE r.epoch_no < (SELECT epoch_no FROM block WHERE hash = $2)) - 
+  JOIN block ON
+    block.id = r.block_id
+  WHERE stake_address.view = $1
+  AND block.epoch_no < (SELECT epoch_no FROM block WHERE hash = $2))- 
   (SELECT COALESCE(SUM(w.amount),0) 
   FROM withdrawal w
   JOIN tx ON tx.id = w.tx_id AND 
     tx.block_id <= (SELECT id FROM block WHERE hash = $2)
-  JOIN stake_address ON stake_address.id = w.addr_id AND
-   stake_address.view = $1) 
+  JOIN stake_address ON stake_address.id = w.addr_id
+  WHERE stake_address.view = $1) 
   AS balance
 `;