Various Texture precision fixes/improvements

OSDDVDFO/NF was not same element size as the other OSD textures, this
was raher obvious when viewing onscreen it now has 3 pixels padding same
as outer ring on other OSD textures.

icon_video and icon-video both had precision issues. when viwing on
larger screens this was slightly obvious.

CalibrateSubtitles Did it ever match the other calibrate textures? Now
it does for sure.

Overlay Watching was much darker the say the watched overlay this made
no sense but if it was intentional please let me know it can be
reverted...