message: Arrow function to prevent error in Sign Message
diff: @@ -85,7 +85,7 @@ export class SignMessage extends Component<Props, State> {
  this.setState({ signedMessage });
  };
  - private renderSignButton(fullWallet: IFullWallet) {
  + private renderSignButton = (fullWallet: IFullWallet) => {
  return (
  <SignButton
  wallet={fullWallet}
  @@ -94,7 +94,7 @@ export class SignMessage extends Component<Props, State> {
  onSignMessage={this.onSignMessage}
  />
  );
  - }
  + };
  private renderUnlock() {
  return <WalletDecrypt />;
  