drop kerneloops package from all build definitions

it was dropped from debian unstable and hence trixie and ubuntu plucky. The
kerneloops.org website has been gone for about 5 years already so while the
package is still available for example in jammy, it is completely useless
in 2025.

- https://bugs.debian.org/953172
- https://bugs.launchpad.net/ubuntu/+bug/1930877

config/desktop/common/environments/xmonad/config_base/packages

@@ -49,7 +49,6 @@ gvfs-backends
 hplip
 indicator-printers
 inputattach
-kerneloops
 keyutils
 language-pack-de
 language-pack-en