Remove Tor Browser Bug#27987 (Taking screenshots on Tor Browser Android) from Mobile Tor's list of known issues

The bug is resolved: tpo/applications/tor-browser#27987 (closed)

Let's remove it from the "Known Issues": https://tb-manual.torproject.org/mobile-tor/

added Documentation label

added Backlog label

added Project 163 label

removed Backlog label

Time estimation

• complexity: small (1 day)
• uncertainty: low (x1.1)
• Reference

assigned to @ebanam

added Doing label

mentioned in merge request !124 (merged)

added Needs Review label and removed Doing label

added 10m of time spent

mentioned in commit e45ec95c

closed with merge request !124 (merged)

mentioned in commit tpo/translation@4c4d12f6