Have onionshare 0.9+ in jessie-backports

Originally created by @intrigeri on #12021 (Redmine)

046aa79b says we need it, and feature/7870-include_onionshare currently installs a custom backport from our custom APT repo. Once done, 738f6491 must be reverted, and the APT pinning adjusted.

Feature Branch: feature/7870-include_onionshare

Parent Task: #7870 (closed)

Edited May 15, 2020 by intrigeri

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