SASL ANONYMOUS (no UI)

Merge branch 'pebble-notification' of https://github.com/danielegobbetti/Conversations into danielegobbetti-pebble-notification

Not just the resourcepart

This fixes the issue where the first message in the notification was sent to pebble
(and possibly to other wear devices) for every update in the conversation, as
reported in #1249.

This is the same patch propoed in https://github.com/siacs/Conversations/issues/1249#issuecomment-245878335

Fix typo