ControllerInterface: replace Reinitialize with RefreshDevices

The SDL backend crashes when you close a joystick after SDL_Quit has
been called. Some backends don't need to be shutdown and
re-initialized everytime, we can just ask to enumerate devices again.

Source/Core/InputCommon/ControllerInterface/SDL/SDL.h

@@ -21,6 +21,7 @@ namespace ciface
 namespace SDL
 {
 void Init();
+void PopulateDevices();
 
 class Joystick : public Core::Device
 {