Fix for letter tile avatars not displaying properly in calllog DO NOT MERGE

Renable an accidentally disabled line of code which would retrieve
the lookup key from the lookup URI, allowing letter tile avatars
to display with the correct color and letter. 

Bug: 13341898
Change-Id: Ic65352053234e37f580aa44d9ed459755c3913f1
(cherry picked from commit a5804f5b)