InputConfigDialog: use SelectObjectAsSource in UpdateBitmaps

Fixes issue [Configuring an Emulated Wiimote crashes the application on
OS X 10.12 Sierra][1]

[1]: https://bugs.dolphin-emu.org/issues/9832

Source/Core/DolphinWX/InputConfigDiagBitmaps.cpp

@@ -500,7 +500,7 @@ void InputConfigDialog::UpdateBitmaps(wxTimerEvent& WXUNUSED(event))
 
     wxBitmap bitmap(g->static_bitmap->GetBitmap());
     // NOTE: Selecting the bitmap inherits the bitmap's ScaleFactor onto the DC as well.
-    dc.SelectObject(bitmap);
+    dc.SelectObjectAsSource(bitmap);
     dc.SetBackground(*wxWHITE_BRUSH);
     dc.Clear();