message: Fix variable shadowing in qt/signverifymessagedialog.cpp
  qt/signverifymessagedialog.cpp:54:53: warning: declaration shadows a field of 'SignVerifyMessageDialog' [-Wshadow]
  void SignVerifyMessageDialog::setModel(WalletModel *model) { this->model = model; }
  ^
  ./qt/signverifymessagedialog.h:39:18: note: previous declaration is here
  WalletModel *model;
  ^
diff: @@ -51,7 +51,7 @@ SignVerifyMessageDialog::SignVerifyMessageDialog(const PlatformStyle *platformSt
  }
  SignVerifyMessageDialog::~SignVerifyMessageDialog() { delete ui; }
  -void SignVerifyMessageDialog::setModel(WalletModel *model) { this->model = model; }
  +void SignVerifyMessageDialog::setModel(WalletModel *_model) { this->model = _model; }
  void SignVerifyMessageDialog::setAddress_SM(const QString &address)
  {
  ui->addressIn_SM->setText(address);
  