D9580: Fix saving annotations to gzipped files

[Henrik Fehlauer]

rkflx added a reviewer: Okular.

REPOSITORY
  R223 Okular

REVISION DETAIL
  https://phabricator.kde.org/D9580

To: rkflx, aacid, #okular
Cc: #okular, michaelweghorn, gassaf, ngraham, aacid
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