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/DInput/DInput.h

@@ -20,6 +20,6 @@ BOOL CALLBACK DIEnumDeviceObjectsCallback(LPCDIDEVICEOBJECTINSTANCE lpddoi, LPVO
 BOOL CALLBACK DIEnumDevicesCallback(LPCDIDEVICEINSTANCE lpddi, LPVOID pvRef);
 std::string GetDeviceName(const LPDIRECTINPUTDEVICE8 device);
 
-void Init(HWND hwnd);
+void PopulateDevices(HWND hwnd);
 }
 }