Remove keyboard-sfx package

The only thing it does is install a bunch of .wav files that are not used in any place.

recipes/other/keyboard-sfx/recipe.sh

-GIT=https://gitlab.redox-os.org/redox-os/keyboard-sfx.git
-
-function recipe_version {
-    echo "0.0.1"
-    skip=1
-}
-
-function recipe_build {
-    echo "skipping build"
-    skip=1
-}
-
-function recipe_clean {
-    echo "skipping clean"
-    skip=1
-}
-
-function recipe_stage {
-    mkdir -pv "$1/sfx"
-    cp -Rv ./* "$1/sfx"
-    skip=1
-}