bug fix: unstake过程中某些条件下包web3Provider为null

src/components/chain/BlockChain.js

@@ -161,6 +161,7 @@ export class BlockChain {
       throw new Error(errmsg);
     }
     this.eoaProvider = provider;
+    this.eoaWallet = walletInstance;
     this.store.eoaAddress = accounts[0];
     this.store.eoaType = wallet;
     this.store.$persist();