Qt: Remove "What's this" button

Source/Core/DolphinQt2/NetPlay/MD5Dialog.cpp

@@ -31,6 +31,7 @@ MD5Dialog::MD5Dialog(QWidget* parent) : QDialog(parent)
   CreateWidgets();
   ConnectWidgets();
   setWindowTitle(tr("MD5 Checksum"));
+  setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
 }
 
 void MD5Dialog::CreateWidgets()

Source/Core/DolphinQt2/NetPlay/NetPlaySetupDialog.cpp

@@ -24,6 +24,7 @@ NetPlaySetupDialog::NetPlaySetupDialog(QWidget* parent)
     : QDialog(parent), m_game_list_model(Settings::Instance().GetGameListModel())
 {
   setWindowTitle(tr("Dolphin NetPlay Setup"));
+  setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
 
   CreateMainLayout();