Small fix: make node backdrop draw with nearest-pixel filter, so it zooms in 
showing pixels. Issue was it also blurred image at zoom level 1... maybe subpixel
issue. Anyway - for inspecting exact composite results, zooming in showing pixels
is nicer anyway.



git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@55446 954f8c5b-7b00-dc11-b283-0030488c597c