Revert floor.png scrollbar bg/progress outline

No scrollbar blue bg even though even though original unmodified was
blue too  color was #b7e6fb and now its # 1a1d1f which is dark grey.

Floorpng is original untouched.

Tweaked the progress bar outline color to much faded shade now.

Updated Test Textures.xbt to match this commit and all other changes.

idk how to squash commits and push to PR.