Updated picker UI for linking and send to labels.

Changed the look of the pickers to be more consistent,
also removed header indexes from send to labels picker
to make more room for displaying phones and emails.

Test: Manual, verified pickers were being displayed correctly
in both regular and RTL modes.

Bug: 30418005
Change-Id: I3d7b8aa43b1fb553aced494f3b7bb38bb2b45a27