Fix version attribute for OPML exports

Stephan Seitzrequested to merge
stephanseitz/alligator:fix-ompl-version into master

OPML version was erroneously set on <body> instead of <opml>. This prevented parsing by Newsflash (https://flathub.org/en/apps/io.gitlab.news_flash.NewsFlash).

See OMPL documents at https://en.wikipedia.org/wiki/OPML or https://opml.org/spec2.opml

BUG: 512743

Edited by Stephan Seitz

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