Fix CRT shader for Pixel/Other devices

[siameseneko-dev]

Removes the noise part of the shader.
I isolated it as the cause of the black void, also fixes the game looking desaturated.

[Neulus]

i've tested it and, the core cause looks like pixel's gpu mod behaves strangely on the small precision. using num * fract(x / num) behaves correctly. patching:

MY_HIGHP_OR_MEDIUMP number x = (tc.x - mod(tc.x, 0.002)) * (tc.y - mod(tc.y, 0.0013)) * time * 1000.0;

to

MY_HIGHP_OR_MEDIUMP number x = (tc.x - 0.002 * fract(tc.x / 0.002)) * (tc.y - 0.0013 * fract(tc.y / 0.0013)) * time * 1000.0;

works fine on my pixel 9.