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/Xlib/XInput2.h

@@ -18,7 +18,7 @@ namespace ciface
 {
 namespace XInput2
 {
-void Init(void* const hwnd);
+void PopulateDevices(void* const hwnd);
 
 class KeyboardMouse : public Core::Device
 {