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.cpp

@@ -47,6 +47,12 @@ void Init()
     // Failed to initialize
     return;
   }
+}
+
+void PopulateDevices()
+{
+  if (!(SDL_WasInit(SDL_INIT_EVERYTHING) & SDL_INIT_JOYSTICK))
+    return;
 
   // joysticks
   for (int i = 0; i < SDL_NumJoysticks(); ++i)