Use phoneAccountHandle based on connection

After triggering dial, phoneAccountHandle can be changed.
In this case, the stack to which dial is requested and
the stack to be displayed on the UI can be different.
So, modified to use phoneAccountHandle which base on
connection, not request.

Bug: 168681491
Test: manual

Signed-off-by: Sungjae <sung_jae.kim@samsung.com>
Change-Id: I56ac5b2d4f1b5e8d78741a43a332b025af7e4d54