Debloat ConversationAdapter's tag

getName() includes the full package name, which adds a ridiculous
amount of text to the debug log. Using getSimpleName() is in line with
the rest of the repository.

Closes https://github.com/signalapp/Signal-Android/pull/6202
// FREEBIE

Upstream commit: https://github.com/signalapp/Signal-Android/commit/e1f09e04377a6db98b3d783e4548f77c2dec8401
3 jobs for unstable in 7 minutes and 22 seconds (queued for 7 minutes and 58 seconds)
Status Name Job ID Coverage
  Build
passed assembleDebug #639

00:01:54

passed buildWitness #638

00:00:30

 
  Test
passed debugTests #640

00:04:57