fix(connector-xdai): web3.eth.estimateGas, works considering called s…

…olidity method do not throw an exception. So, for method having modifier with access control on msg.sender calling estimateGas without from field throws error.to make it work ,transactionConfig.from = web3SigningCredential.ethAccount before calling estimateGas

Signed-off-by: Pritam Singh <pkspritam16@gmail.com>

packages/cactus-plugin-ledger-connector-xdai/src/main/typescript/plugin-ledger-connector-xdai.ts

@@ -292,10 +292,10 @@ export class PluginLedgerConnectorXdai
       const payload = (method.send as any).request();
       const { params } = payload;
       const [transactionConfig] = params;
+      transactionConfig.from = web3SigningCredential.ethAccount;
       if (req.gas == undefined) {
         req.gas = await this.web3.eth.estimateGas(transactionConfig);
       }
-      transactionConfig.from = web3SigningCredential.ethAccount;
       transactionConfig.gas = req.gas;
       transactionConfig.gasPrice = req.gasPrice;
       transactionConfig.value = req.value;