Call the SetWindowIcon function on the OpenGL window

src/yuzu_cmd/emu_window/emu_window_sdl2_gl.cpp

@@ -119,6 +119,8 @@ EmuWindow_SDL2_GL::EmuWindow_SDL2_GL(InputCommon::InputSubsystem* input_subsyste
     dummy_window = SDL_CreateWindow(NULL, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 0, 0,
                                     SDL_WINDOW_HIDDEN | SDL_WINDOW_OPENGL);
 
+   SetWindowIcon();     
+
     if (fullscreen) {
         Fullscreen();
     }