Qt: CustomizeWindowHint should be set for no-close-button

src/duckstation-qt/logwindow.cpp

@@ -111,6 +111,7 @@ void LogWindow::createUi()
   QIcon icon;
   icon.addFile(QString::fromUtf8(":/icons/duck.png"), QSize(), QIcon::Normal, QIcon::Off);
   setWindowIcon(icon);
+  setWindowFlag(Qt::CustomizeWindowHint, true);
   setWindowFlag(Qt::WindowCloseButtonHint, false);
   updateWindowTitle();
 

src/duckstation-qt/qtprogresscallback.cpp

@@ -19,6 +19,7 @@ QtModalProgressCallback::QtModalProgressCallback(QWidget* parent_widget, float s
   m_dialog.setModal(parent_widget != nullptr);
   m_dialog.setAutoClose(false);
   m_dialog.setAutoReset(false);
+  m_dialog.setWindowFlag(Qt::CustomizeWindowHint, true);
   m_dialog.setWindowFlag(Qt::WindowCloseButtonHint, false);
   connect(&m_dialog, &QProgressDialog::canceled, this, &QtModalProgressCallback::dialogCancelled);
   checkForDelayedShow();