Update tracing restriction to ro.debuggable=1

Previously we checked if it was a user build, but this doesn't work for OEMs that run user builds + debuggable=1 for testing, to bypass app restrictions.

Bug: 407861081
Test: atest FlickerTests
Flag: EXEMPT bugfix
Change-Id: I7a6a387aa8cb3f5ea0a4779b9280bee4d47edbe0