builtin.conf: remove debanding from the high-quality profile

Debanding is an inherently destructive process. It is not needed for
most high-quality sources and only produces an adverse smoothing effect
when applied to fine-detailed content, removing detail. It should only
be applied when necessary, either manually with the `b` keybind or with
an automatic profile.

Additionally, it is quite computationally heavy with no real benefit for
high-quality content.

By default, and especially in the high-quality profile, mpv should
preserve source detail and quality as much as possible. Additional
processing should be opt-in.

DOCS/interface-changes.rst

@@ -64,6 +64,7 @@ Interface changes
     - add `video-target-params` property
     - add `hdr10plus` sub-parameter to `format` video filter
     - remove `--focus-on-open` and add replacement `--focus-on`
+    - remove debanding from the high-quality profile
  --- mpv 0.37.0 ---
     - `--save-position-on-quit` and its associated commands now store state files
       in %LOCALAPPDATA% instead of %APPDATA% directory by default on Windows.

etc/builtin.conf

@@ -54,7 +54,6 @@ allow-delayed-peak-detect=yes
 scale=ewa_lanczossharp
 hdr-peak-percentile=99.995
 hdr-contrast-recovery=0.30
-deband=yes
 
 # Deprecated alias
 [gpu-hq]