Qt: Use window modality for message boxes

Stops them opening in the middle of the screen on MacOS.

src/duckstation-qt/consolesettingswidget.cpp

@@ -141,6 +141,7 @@ void ConsoleSettingsWidget::onEnableCPUClockSpeedControlChecked(int state)
          "have confirmed the bug also occurs with overclocking disabled.\n\nThis warning will only be shown once.");
 
     QMessageBox mb(QMessageBox::Warning, tr("CPU Overclocking Warning"), message, QMessageBox::NoButton, this);
+    mb.setWindowModality(Qt::WindowModal);
     const QAbstractButton* const yes_button =
       mb.addButton(tr("Yes, I will confirm bugs without overclocking before reporting."), QMessageBox::YesRole);
     mb.addButton(tr("No, take me back to safety."), QMessageBox::NoRole);

src/duckstation-qt/mainwindow.cpp

@@ -1154,6 +1154,7 @@ std::optional<bool> MainWindow::promptForResumeState(const std::string& save_sta
   QMessageBox msgbox(this);
   msgbox.setIcon(QMessageBox::Question);
   msgbox.setWindowTitle(tr("Load Resume State"));
+  msgbox.setWindowModality(Qt::WindowModal);
   msgbox.setText(tr("A resume save state was found for this game, saved at:\n\n%1.\n\nDo you want to load this state, "
                     "or start from a fresh boot?")
                    .arg(QDateTime::fromSecsSinceEpoch(sd.ModificationTime, Qt::UTC).toLocalTime().toString()));
@@ -2749,6 +2750,7 @@ bool MainWindow::requestShutdown(bool allow_confirm /* = true */, bool allow_sav
     QMessageBox msgbox(lock.getDialogParent());
     msgbox.setIcon(QMessageBox::Question);
     msgbox.setWindowTitle(tr("Confirm Shutdown"));
+    msgbox.setWindowModality(Qt::WindowModal);
     msgbox.setText(tr("Are you sure you want to shut down the virtual machine?"));
 
     QCheckBox* save_cb = new QCheckBox(tr("Save State For Resume"), &msgbox);
@@ -2992,6 +2994,7 @@ void MainWindow::checkForUpdates(bool display_message)
     {
       QMessageBox mbox(this);
       mbox.setWindowTitle(tr("Updater Error"));
+      mbox.setWindowModality(Qt::WindowModal);
       mbox.setTextFormat(Qt::RichText);
 
       QString message;

src/duckstation-qt/qttranslations.cpp

@@ -304,6 +304,7 @@ bool QtHost::DownloadMissingFont(QWidget* dialog_parent, const char* font_name,
   {
     QMessageBox msgbox(dialog_parent);
     msgbox.setWindowTitle(qApp->translate("QtHost", "Missing Font File"));
+    msgbox.setWindowModality(Qt::WindowModal);
     msgbox.setWindowIcon(QtHost::GetAppIcon());
     msgbox.setIcon(QMessageBox::Critical);
     msgbox.setTextFormat(Qt::RichText);