Bump qrcode from 1.4.1 to 1.4.2 in /desktop/js_files

Bumps [qrcode](https://github.com/soldair/node-qrcode) from 1.4.1 to 1.4.2.
- [Release notes](https://github.com/soldair/node-qrcode/releases)
- [Changelog](https://github.com/soldair/node-qrcode/blob/master/CHANGELOG.md)
- [Commits](soldair/node-qrcode@v1.4.1...v1.4.2)

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