script:setup: Use $HOME instead of $USER for download dir path

setup-environment

@@ -296,8 +296,8 @@ if "$build_dir_setup_enabled"; then
                 echo 'INHERIT += "own-mirrors"'
                 echo "SOURCE_MIRROR_URL = \"file://$DL_DIR_GLOBAL\""
                 message "Using $DL_DIR_GLOBAL as local mirror."
-                echo "DL_DIR ?= \"/home/$USER/yocto_downloads\""
-                message "Using /home/$USER/yocto_downloads for downloads."
+                echo "DL_DIR ?= \"$HOME/yocto_downloads\""
+                message "Using $HOME/yocto_downloads for downloads."
             else
                 echo "DL_DIR ?= \"$DL_DIR_GLOBAL\""
                 message "Using $DL_DIR_GLOBAL for downloads."