Don't create empty webadmin setup file

src/freedombone-utils-webadmin

@@ -591,7 +591,6 @@ function image_install_web_admin {
     if [[ "$ONION_ONLY" != 'no' ]]; then
         web_admin_onion_only
     fi
-    touch "$rootdir$webadmin_install_dir/setup.txt"
     touch "$rootdir$webadmin_install_dir/.setupscreenactive"
 
     nginx_file=${rootdir}/etc/nginx/sites-available/${local_hostname}