Fix "Unknown" label in conference calls.

Use properties instead of children for determining whether a call
is a conference call. This makes solid sense, but is a smidgen
theoretical; worked correctly for 10/10 when I just tested now.

Bug: 17304243
Change-Id: I28dc948688b3c1fb85e2984bc77b5949cc730c2e
1 file changed
tree: b631ae7425d63a0be1bc8db6bebfe272c704582e
  1. InCallUI/