[Merge] lp:~phablet-team/messaging-app/group_initials_as_avatar into lp:messaging-app/staging

[Tiago Salem Herrmann]

Review: Needs Fixing

I think this is not working correctly for broadcast messages.
I am seeing "R5" for a broadcast that the title is "Roberto +5", "B3" where the broadcast title is "Bill +3".
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https://code.launchpad.net/~phablet-team/messaging-app/group_initials_as_avatar/+merge/310806
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