set window position to 0, 0

src/screensaver.d

@@ -105,8 +105,8 @@ class ScreenSaver
         SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, 4);
 
         m_window = SDL_CreateWindow("Gentex ScreenSaver",
-                                    SDL_WINDOWPOS_UNDEFINED,
-                                    SDL_WINDOWPOS_UNDEFINED,
+                                    0,
+                                    0,
                                     m_width,
                                     m_height,
                                     SDL_WINDOW_OPENGL | SDL_WINDOW_BORDERLESS);