Remove this shared pointer nonsense

src/app/gfx/snes_palette.cc

@@ -105,9 +105,6 @@ SDL_Palette* SNESPalette::GetSDL_Palette() {
               << " G:" << color[i].g << " B:" << color[i].b << ")" << std::endl;
   }
   sdl_palette->colors = color.data();
-
-  // store the pointers to free them later
-  sdl_palettes_.push_back(sdl_palette);
   colors_.push_back(color);
 
   return sdl_palette.get();

src/app/gfx/snes_palette.h

@@ -40,7 +40,6 @@ class SNESPalette {
 
   int size_ = 0;
   std::vector<SNESColor> colors;
-  std::vector<std::shared_ptr<SDL_Palette>> sdl_palettes_;
   std::vector<SDL_Color*> colors_arrays_;
   std::vector<std::vector<SDL_Color>> colors_;
 };