Create new methods to handle btc tx deserialization without inputs to…

… avoid passing boolean

rskj-core/src/main/java/co/rsk/peg/BridgeStorageProvider.java

@@ -562,7 +562,7 @@ public Optional<BtcTransaction> getSvpFundTxSigned() {
         }
 
         svpFundTxSigned = safeGetFromRepository(SVP_FUND_TX_SIGNED,
-            data -> BridgeSerializationUtils.deserializeBtcTransaction(data, networkParameters));
+            data -> BridgeSerializationUtils.deserializeSvpFundTx(data, networkParameters));
         return Optional.ofNullable(svpFundTxSigned);
     }