simpleperf: fix passing --user to simpleperf_app_runner.

simpleperf_app_runner on Android < S doesn't support --user option.
To not break python tests, switch to only pass --user in multi-user
environment (user_id != 0).

Bug: 174706389
Test: run simpleperf_unit_test.
Test: run test.py.
Change-Id: I446717b3cc692a08edd17ea6c5772c26b4a7e1a8
1 file changed