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.

Context: go/winscope-debuggable-user-builds

Bug: 407861081
Test: atest FlickerTests
Flag: EXEMPT bugfix
Change-Id: Iee19e2580b441fac3d1b1af24582b03ca7ee819f