deepin.dde-daemon: fix can't set custom wallpapers

diff --git a/bin/dde-system-daemon/wallpaper.go b/bin/dde-system-daemon/wallpaper.go

index d4af13da..1ff36f84 100644

--- a/bin/dde-system-daemon/wallpaper.go

+++ b/bin/dde-system-daemon/wallpaper.go

@@ -24,7 +24,7 @@ import (

 const maxCount = 5

 const maxSize = 32 * 1024 * 1024

-const wallPaperDir = "/usr/share/wallpapers/custom-wallpapers/"

+const wallPaperDir = "/var/lib/dde-daemon/wallpapers/custom-wallpapers/"

 func GetUserDir(username string) (string, error) {

 	dir := filepath.Join(wallPaperDir, username)

@@ -136,7 +136,7 @@ func (d *Daemon) SaveCustomWallPaper(sender dbus.Sender, username string, file s

 		"-u",

 		username,

 		"--",

-		"head",

+		"@coreutils@/bin/head",

 		"-c",

 		"0",

 		file,

, xdotool

, getconf

, dbus

, coreutils

, util-linux

, dde-session-ui

}:

buildGoPackage rec {

      src = ./0004-aviod-use-hardcode-path.patch;

      inherit dbus;

    })

    (substituteAll {

      src = ./0005-fix-custom-wallpapers-path.diff;

      inherit coreutils;

    })

  ];

  postPatch = ''

    substituteInPlace system/uadp/crypto.go \

      --replace "/usr/share/uadp" "/var/lib/dde-daemon/uadp"

    substituteInPlace appearance/background/{background.go,custom_wallpapers.go} accounts/user.go bin/dde-system-daemon/wallpaper.go \

    substituteInPlace appearance/background/{background.go,custom_wallpapers.go} accounts/user.go \

     --replace "/usr/share/wallpapers" "/run/current-system/sw/share/wallpapers"

    substituteInPlace appearance/manager.go timedate/zoneinfo/zone.go \

    runHook postInstall

  '';

  preFixup = ''

    gappsWrapperArgs+=(

      --prefix PATH : "${lib.makeBinPath [ util-linux dde-session-ui ]}"

    )

  '';

  postFixup = ''

    for f in "$out"/lib/deepin-daemon/*; do

      echo "Wrapping $f"