GSdx: Quick workaround for DX9 until the shader is adapted.

git-svn-id: http://pcsx2.googlecode.com/svn/trunk@5813 96395faa-99c1-11dd-bbfe-3dabce05a288
GSdx: Newest scanlines shader looks much nicer this way :)

git-svn-id: http://pcsx2.googlecode.com/svn/trunk@5814 96395faa-99c1-11dd-bbfe-3dabce05a288