Qt: Minor window fixes

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

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();