Use uncompressed dex for all preopted system targets

Extend default use of uncompressed dex for non-privileged system apps
that are preopted. This avoids unnecessary disk usage on the
/system_other/ partition, as well as the marginal overhead of
extraction after mainline updates.

In total, this saves ~5-15MB cumulatively across partitions.

Bug: 318730708
Test: m + compare image sizes
Change-Id: Id0a06965e61763f59c53cbe2b327cdcf1e5d422b