nixosTests.lomiri-clock-app: Fix OCR further (#502290)

        variables = {

          UITK_ICON_THEME = "suru";

        };

        # App has a somewhat small horizontal max size and a white background, while we configure IceWM to have a black background.

        # Makes OCR less reliable, often completely fails to find the localised text. Force background to be white instead.

        etc."icewm/prefoverride".text = ''

          DesktopBackgroundColor=#FFFFFF

        '';

      };

      i18n.supportedLocales = [ "all" ];