Change versionInfoButton logic to use disable instead of hide()

Co-authored-by: div72 <60045611+div72@users.noreply.github.com>

src/qt/aboutdialog.cpp

@@ -17,7 +17,8 @@ AboutDialog::AboutDialog(QWidget *parent) :
  if (!fTestNet) {
  connect(ui->versionInfoButton, &QAbstractButton::pressed, this, [this]() { handlePressVersionInfoButton(); });
  } else {
- ui->versionInfoButton->hide();
+ ui->versionInfoButton->setDisabled(true);
+ ui->versionInfoButton->setToolTip(tr("Version information is not available on testnet."));
  }
 }