[Pkg-mozext-maintainers] Bug#969742: ublock-origin: incomplete copyright information

[Ansgar]

Source: ublock-origin
Source-Version: 1.29.0+dfsg-1

While reviewing ublock-origin in NEW, I noticed several files not
covered in d/copyright.  At least:

  src/css/fonts/Inter/*:
    Copyright (c) 2016-2020 The Inter Project Authors
    SIL Open Font License, Version 1.1

  src/css/fonts/Metropolis/*:
    Unlicense

  src/js/codemirror/search.js, src/lib/codemirror:
    // CodeMirror, copyright (c) by Marijn Haverbeke and others
    // Distributed under an MIT license: http://codemirror.net/LICENSE

Please keep d/copyright current.

Ansgar