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.cpp

@@ -46,7 +46,7 @@ namespace ciface
 namespace XInput2
 {
 // This function will add zero or more KeyboardMouse objects to devices.
-void Init(void* const hwnd)
+void PopulateDevices(void* const hwnd)
 {
   Display* dpy = XOpenDisplay(nullptr);