Enable non final ids for non BusyBox builds

Non final ids is a prerequisite for using optimized shrinking and
it will soon be a hard R8 error if you pass final ids in R classes
with optimized shrinking enabled.

Bug: 325905703
Test: SystemUIGo with optimized shrinking
Change-Id: I364edc5a0b22be7b4d737c2aa470a84704d05283