DolphinQt: Remove redundant window hints

Remove window hints clearing the flag Qt::WindowContextHelpButtonHint,
which is already off by default in Qt 6.

In Qt 5 this flag was set by default for QDialogs, and on Windows put a
? button in the corner of the title bar allowing users to activate Qt's
QWhatsThis help system for a given widget. Since we don't set that text
the ? button was useless and so we hid it manually.

Source/Core/DolphinQt/NetPlay/ChunkedProgressDialog.cpp

@@ -45,7 +45,6 @@ ChunkedProgressDialog::ChunkedProgressDialog(QWidget* parent) : QDialog(parent)
   CreateWidgets();
   ConnectWidgets();
   setWindowTitle(tr("Data Transfer"));
-  setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
 }
 
 void ChunkedProgressDialog::CreateWidgets()

Source/Core/DolphinQt/NetPlay/GameListDialog.cpp

@@ -14,7 +14,6 @@
 GameListDialog::GameListDialog(const GameListModel& game_list_model, QWidget* parent)
     : QDialog(parent), m_game_list_model(game_list_model)
 {
-  setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
   setWindowTitle(tr("Select a game"));
 
   CreateWidgets();

Source/Core/DolphinQt/NetPlay/NetPlayBrowser.cpp

@@ -32,7 +32,6 @@
 NetPlayBrowser::NetPlayBrowser(QWidget* parent) : QDialog(parent)
 {
   setWindowTitle(tr("NetPlay Session Browser"));
-  setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
 
   CreateWidgets();
   RestoreSettings();
@@ -297,7 +296,6 @@ void NetPlayBrowser::accept()
   {
     QInputDialog dialog(this);
 
-    dialog.setWindowFlags(dialog.windowFlags() & ~Qt::WindowContextHelpButtonHint);
     dialog.setWindowTitle(tr("Enter password"));
     dialog.setLabelText(tr("This session requires a password:"));
     dialog.setWindowModality(Qt::WindowModal);

Source/Core/DolphinQt/NetPlay/NetPlayDialog.cpp

@@ -97,8 +97,6 @@ NetPlayDialog::NetPlayDialog(const GameListModel& game_list_model,
     : QDialog(parent), m_game_list_model(game_list_model),
       m_start_game_callback(std::move(start_game_callback))
 {
-  setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
-
   setWindowTitle(tr("NetPlay"));
   setWindowIcon(Resources::GetAppIcon());
 

Source/Core/DolphinQt/NetPlay/NetPlaySetupDialog.cpp

@@ -32,7 +32,6 @@ NetPlaySetupDialog::NetPlaySetupDialog(const GameListModel& game_list_model, QWi
     : QDialog(parent), m_game_list_model(game_list_model)
 {
   setWindowTitle(tr("NetPlay Setup"));
-  setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
 
   CreateMainLayout();
 

Source/Core/DolphinQt/NetPlay/PadMappingDialog.cpp

@@ -17,7 +17,6 @@
 
 PadMappingDialog::PadMappingDialog(QWidget* parent) : QDialog(parent)
 {
-  setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
   setWindowTitle(tr("Assign Controllers"));
 
   CreateWidgets();