passpoint-r2: copy updateIdenfier field in the copy constructor

It needs to be copied for R2 connection

Bug: 117958599
Test: ./frameworks/base/wifi/tests/runtests.sh
Test: capture the sniffer log while associating R2 AP.
Change-Id: Ia38d5f8f405c7eb72e3dedca5d5c48a93489a611
Signed-off-by: Ecco Park <eccopark@google.com>