shaders: Stop using ortho in glsl-const tests.
Scripted with sed with fix ups to - not - actually writes .w component, so probe rgba. - reflect - writes const 1.0 .w component, so probe rgb. - cosh - writes const 1.0 .w component, and used probe rgb with 4 components, so drop the .w from the probe. Reviewed-by: Kenneth Graunke <firstname.lastname@example.org>