Fixed activity not started for current user

In headless mode, the activity started by the phone process needs
to be started for the current user, because phone process is always
running as the system user, and the actual user is running as
the secondary user.

Fix: 365861945
Test: Basic telephony functionality tests
Test: atest FrameworksTelephonyTests
Test: atest TeleServiceTests
Flag: EXEMPT bug fix
Change-Id: Ibaeeb67b64224d7eea39287d1e0dc8cfbdc3ef83