Fixed incall UI to emulate single party call correctly when one
participant dropped during conference creation.

Test: atest com.android.services.telephony.ImsConferenceTest#testSinglePartyEmulationWithOneParticipantAtBegining
Bug: 141927833
Merged-In: I2048ab6fbad428e1ae2fb2d65c7c95f541e131c2
Change-Id: I2048ab6fbad428e1ae2fb2d65c7c95f541e131c2
(cherry picked from commit cebf18cb5d2cc9ec6e8f8513dfc050e578246d60)
2 files changed