Conversation visual updates

* Height now 88dp
* Avatar now 48dp from 52dp
* Call style updated to match
* Conversation header views update to use baseline alignment instead of vertical centering.
* "feedback" icon changed to use baseline alignment instead of vertical centering.

Fixes: 184941325
Test: visual
Change-Id: I7c19d298eae1806e01761054d10b93b02ad4680f