[incremental] increase progress comparison precision

This ensures that the package is not regarded as fully loaded even if
only 1 page is missing in a 4GB app.

BUG: 182205656
Test: atest android.cts.statsdatom.statsd.IncrementalAtomTests
Change-Id: Id6f41a77c690c01cf0d210e6b09708572a36e088