Always expose the high density video modes in the mode list

The SDL_HINT_VIDEO_ENABLE_HIGH_PIXEL_DENSITY hint is going away, so this matches the macOS logic

src/video/wayland/SDL_waylandvideo.c

@@ -529,7 +529,6 @@ static void display_handle_mode(void *data,
 static void display_handle_done(void *data,
                                 struct wl_output *output)
 {
-    const SDL_bool highdpi_enabled = SDL_GetHintBoolean(SDL_HINT_VIDEO_ENABLE_HIGH_PIXEL_DENSITY, SDL_TRUE);
     const SDL_bool mode_emulation_enabled = SDL_GetHintBoolean(SDL_HINT_VIDEO_WAYLAND_MODE_EMULATION, SDL_TRUE);
     SDL_DisplayData *driverdata = (SDL_DisplayData *)data;
     SDL_VideoData *video = driverdata->videodata;
@@ -611,7 +610,7 @@ static void display_handle_done(void *data,
 
     desktop_mode.w = driverdata->screen_width;
     desktop_mode.h = driverdata->screen_height;
-    desktop_mode.pixel_density = highdpi_enabled ? driverdata->scale_factor : 1.0f;
+    desktop_mode.pixel_density = driverdata->scale_factor;
     desktop_mode.refresh_rate = ((100 * driverdata->refresh) / 1000) / 100.0f; /* mHz to Hz */
     desktop_mode.driverdata = driverdata->output;