message: Fix variable warning in qt/guiutil.cpp
  qt/guiutil.cpp:895:15: warning: declaration shadows a local variable [-Wshadow]
  QRect screen = QApplication::desktop()->screenGeometry();
  ^
  qt/guiutil.cpp:890:11: note: previous declaration is here
  QRect screen = QApplication::desktop()->screenGeometry();
  ^
diff: @@ -892,9 +892,9 @@ void restoreWindowGeometry(const QString &strSetting, const QSize &defaultSize,
  if (!pos.x() && !pos.y())
  {
  - QRect screen = QApplication::desktop()->screenGeometry();
  - pos.setX((screen.width() - size.width()) / 2);
  - pos.setY((screen.height() - size.height()) / 2);
  + QRect _screen = QApplication::desktop()->screenGeometry();
  + pos.setX((_screen.width() - size.width()) / 2);
  + pos.setY((_screen.height() - size.height()) / 2);
  }
  parent->resize(size);
  