Remove the .txt file extension from the license identifier as it got
there by mistake and makes `reuse lint` complain.
Fixes: a5ab76da1e0a ("dbus: add the D-Bus daemon, command-line client and tests")
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
-<!-- SPDX-License-Identifier: CC-BY-SA-4.0.txt -->
+<!-- SPDX-License-Identifier: CC-BY-SA-4.0 -->
<!-- SPDX-FileCopyrightText: 2022-2024 Bartosz Golaszewski <bartosz.golaszewski@linaro.org> -->
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