Remove call only after the incall service is bound

When any call (usually outgoing though) is removed before the incall
service is fully bound, wait until the service is bound and aware of the
call before removing it in order to give it a chance to show ui
messages.

Fixes: 128507867
Test: unit, manual
Change-Id: Ia37df275f2972ef15b57df29233cd4538aa8191f