Revert "Include stack traces from keystore2 in bugreports on debuggable builds"

This reverts commit e846316a.

Dumping keystore is not allowed due to an SELinux neverallow rule most
recently added in aosp/3311665.

Bug: 376065666
Test: Check for denial after taking a bug report
Flag: EXEMPT bugfix
Change-Id: I0e6a2ff1578602f7616c12e8fc9253dddaa67779