Fix phone crash while unknown call on sub1

CallIdMaper uses call id to store the call,
when there is EM call attempt on next phone
account, call id will be null reason
it has removed after set up connection
for second phone account.

Fix by remove call before attempt with next
phone account, so that it avoids call being
removed from CallIdMaper which is added
for second phone account

Change-Id: Ifb020102c1ab840032faaf01b63ccc6ef3b74812
CRs-Fixed: 1066647
1 file changed