test background change

src/freedombone-app-postactiv

             if [ ${#temp_background} -gt 0 ]; then
                 POSTACTIV_BACKGROUND_IMAGE_URL="$temp_background"
                 write_config_param "POSTACTIV_BACKGROUND_IMAGE_URL" "$POSTACTIV_BACKGROUND_IMAGE_URL"
-                if [[ $(pleroma_set_background_image_from_url "$POSTACTIV_DOMAIN_NAME" "$POSTACTIV_BACKGROUND_IMAGE_URL" "$POSTACTIV_TITLE" | tail -n 1) == "0" ]]; then
-                    dialog --title $"Set PostActiv background" \
-                           --msgbox $"The background image has been set" 6 60
-                fi
+                pleroma_set_background_image_from_url "$POSTACTIV_DOMAIN_NAME" "$POSTACTIV_BACKGROUND_IMAGE_URL" "$POSTACTIV_TITLE"
+                dialog --title $"Set PostActiv background" \
+                       --msgbox $"The background image has been set" 6 60
             fi
            ;;
     esac