code: Don't use mod.rs based on Rust Style Guide

src/decoder/formats/mod.rs

@@ -1,24 +0,0 @@
-// Copyright (c) 2023 Sophie Herold
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with this program.  If not, see <http://www.gnu.org/licenses/>.
-//
-// SPDX-License-Identifier: GPL-3.0-or-later
-
-mod glycin_proxy;
-mod svg;
-
-pub use glycin_proxy::Glycin;
-pub use svg::{Svg, RSVG_MAX_SIZE};
-
-use super::{DecoderUpdate, UpdateSender};