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/XInput/XInput.cpp

@@ -85,6 +85,12 @@ void Init()
       return;
     }
   }
+}
+
+void PopulateDevices()
+{
+  if (!hXInput)
+    return;
 
   XINPUT_CAPABILITIES caps;
   for (int i = 0; i != 4; ++i)