Correct what D20 claimed the profile tables would do for colour

Measured after building them, on four of the library's 6D DNGs: Adobe
Standard's tables lower mean saturation by 3-9 % at defaults, and the
look at 200 % lowers it further. The 6D's look table scales saturation
by 0.925 in its darkest value rows; it was tuned to sit under Camera
Raw's default RGB tone curve, which DarkRoom does not apply, and the
dark-tone desaturation is what is left without it. On _MG_9080 the
Lightroom preview measures 0.49, the matrix alone 0.38, the profile
0.35.

So the spec's "that gap is most of why the same file looks flatter"
was wrong: the gap is tone. The tables stay — they put each hue where
Adobe put it — and the spec, D20 and the Vivid file now say so.
"Stronger camera look" is removed: a stronger Adobe Standard look is a
less saturated picture, the opposite of its name. The Vivid presets,
measured at 0.40-0.46 on the same frame, are what answers "more
colourful" today.

core/dr-pipeline/presets/vivid.drpl

@@ -3,9 +3,10 @@ drpl 1
 # Vivid: more colour than the default rendering, for the photographer used
 # to Lightroom's richer starting point (camera-profiles.md §9).
 #
-# Most of that difference is the camera profile's look table, which D20 now
-# applies where a profile exists. These go further, and work on every
-# photograph — a JPEG, a body with no profile — because they lean on
+# That difference is mostly Camera Raw's tone curve, not the camera
+# profile: Adobe Standard's look table, which D20 applies, desaturates dark
+# tones (camera-profiles.md §1). So these do the work themselves, and work
+# on every photograph — a JPEG, a body with no profile. They lean on
 # vibrance before saturation: vibrance lifts muted colours most and holds
 # skin back, so a frame gets richer before anything in it looks painted.
 # Saturation, which moves every colour alike, is used sparingly on top.
@@ -66,10 +67,3 @@ colour_mixer.red_sat = -5
 contrast.contrast = 6
 saturation.saturation = -5
 vibrance.vibrance = 25
-
-# The camera profile's own look, pushed: Adobe Standard's look table at
-# 175 % is close to the jump from Adobe Standard to Adobe Vivid. Where the
-# photograph has no profile, only the vibrance moves.
-[preset Stronger camera look]
-camera_profile.look = 175
-vibrance.vibrance = 10