init: Fix the implementation of the task_profiles keyword

The documentation added by commit c9c0bbac ("init: Add task_profiles
init command") mentions that the task_profiles keyword sets process
attributes. Make the implementation of that keyword match the
documentation.

Change-Id: Ia080132f16bfc2488f8c25176d6aed37a2c42780
Signed-off-by: Bart Van Assche <bvanassche@google.com>