net-p2p/tremotesf: update to 2.8.0

ChangeLog: https://github.com/equeim/tremotesf2/releases/tag/2.8.1

Added

• Option to show torrent properties in a panel in the main window instead of dialog
• Ability to set labels on torrents and filter torrent list by labels
• Option to display relative time
• Option to display only names of download directories in sidebar and torrents list

Changed

• Options dialog is rearranged to use multiple tabs
• Message that's shown when trying to add torrent while disconnected from server is now displayed in a dialog instead of main window

Fixed

• Delayed loading of peers for active torrents
• Window activation from clicking on notification
• Not working file dialogs when installed through Flatpak

PR: 286044
(cherry picked from commit 1fbd62e7c4f0024f698b222c0b23927958d4492b)