betterbug: Update selinux policy for betterbug

Update startup_bugreport_requested property to vendor_public for
betterbug to access.

Bug: 237287659
Test: Load Betterbug for accessing startup bugreport reason property
Signed-off-by: George Lee <geolee@google.com>
Change-Id: Idc07e3f4ce425c0167654743fbe1ad8b7ece5e15
3 files changed