Thunderbird updated: copied rebranding from flidas to belenos

Ghost Userrequested to merge
(removed):thunderbird-updated-52.6 into belenos

Ubuntu has released version 52.6 of Thunderbird, without rebranding it. It is actually same version as flidas, so same helper should do the work.

Fixes https://trisquel.info/en/issues/23800

Edited by Ghost User

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