The QRCodeAnalyzer added in v2.3.0 looks suspiciously similar to the one in the Swiss app. If you indeed took it from there, you should probably preserve the licence header.
You may not remove or alter the substance of any license notices
(including copyright notices, patent notices, disclaimers of warranty,
or limitations of liability) contained within the Source Code Form of
the Covered Software [...].
The QRCodeAnalyzer added in v2.3.0 looks suspiciously similar to the one in the Swiss app. If you indeed took it from there, you should probably preserve the licence header.
Quick reminder what the MPL-2.0 licence states: