converters/bibtexconv: Update 2.0.3 => 2.0.4

Changelog:
https://github.com/dreibh/bibtexconv/blob/bibtexconv-2.0.4/ChangeLog

Commit log:
https://github.com/dreibh/bibtexconv/compare/bibtexconv-2.0.3...bibtexconv-2.0.4

While here split long line.

PR: 289762