Qt: Minor window fixes

* Remove some more "What's this?" buttons
* Add some missing titles

Source/Core/DolphinQt2/Config/FilesystemWidget.cpp

@@ -310,6 +310,9 @@ void FilesystemWidget::CheckIntegrity(const DiscIO::Partition& partition)
       std::launch::async, [this, partition] { return m_volume->CheckIntegrity(partition); });
 
   dialog->setLabelText(tr("Verifying integrity of partition..."));
+  dialog->setWindowFlags(dialog->windowFlags() & ~Qt::WindowContextHelpButtonHint);
+  dialog->setWindowTitle(tr("Verifying partition"));
+
   dialog->setMinimum(0);
   dialog->setMaximum(0);
   dialog->show();

Source/Core/DolphinQt2/GameList/GameList.cpp

@@ -400,6 +400,7 @@ void GameList::DeleteFile()
   QMessageBox confirm_dialog(this);
 
   confirm_dialog.setIcon(QMessageBox::Warning);
+  confirm_dialog.setWindowTitle(tr("Confirm"));
   confirm_dialog.setText(tr("Are you sure you want to delete this file?"));
   confirm_dialog.setInformativeText(tr("This cannot be undone!"));
   confirm_dialog.setStandardButtons(QMessageBox::Yes | QMessageBox::Cancel);

Source/Core/DolphinQt2/NetPlay/PadMappingDialog.cpp

@@ -15,6 +15,7 @@
 PadMappingDialog::PadMappingDialog(QWidget* parent) : QDialog(parent)
 {
   setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
+  setWindowTitle(tr("Assign Controllers"));
 
   CreateWidgets();
   ConnectWidgets();

Source/Core/DolphinQt2/Updater.cpp

@@ -33,6 +33,7 @@ void Updater::OnUpdateAvailable(const NewVersionInformation& info)
   int choice = RunOnObject(m_parent, [&] {
     QDialog* dialog = new QDialog(m_parent);
     dialog->setWindowTitle(tr("Update available"));
+    dialog->setWindowFlags(dialog->windowFlags() & ~Qt::WindowContextHelpButtonHint);
 
     auto* label = new QLabel(
         tr("<h2>A new version of Dolphin is available!</h2>Dolphin %1 is available for "