Update tests media.

- viePortText has improved according to Thomas
- flyCircleAnimator... again brightness differences (maybe due to latest material fixes). If that comes up again will have to investigate further.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@5088 dfc29bdd-3216-0410-991c-e03cc46cb475