when lock wallet on ioPayDesktop, dapp can still read wallet from ws. we should lock ws too.

[guo]

[guo]

repo steps:

1. open https://iotex-dapp-sample.herokuapp.com/ or run this sample locally.
2. unlock a wallet and make sure dapp-sample connected
3. lock wallet (switch wallet)
4. refresh dapp-sample. the dapp-sample can still connect.

[ZQ-jhon]

we should resolve it by steps:

1. renderer process should:

window['closeWss'] = () => ipcRederer.send('closeEvent');

2. main process should listen ipcMain.on(closeEvent) and WsInstance.disconnect();

3. in react state change: window.closeWss();