tests: bsim: bluetooth: ll: multiple_id: Fix test termination

Calling `bs_trace_silent_exit` after successful test completion of one of
devices causes termination of the entires tests suite without letting
other devices complete the test.

This commit move `bs_trace_silent_exit` call to `test_tick_f` handler,
which is triggered when time set by
`bst_ticker_set_next_tick_absolute` expires.

Signed-off-by: Pavel Vasilyev <pavel.vasilyev@nordicsemi.no>