Track the correct package manager field

Static shared libraries were not being properly tracked and snapshotted.
This meant that any lookups that didn't involve the live data structure
were incorrect; it was as if the platform had no static shared libraries
at all.

Fixes: 189851804
Bug: 188661399
Bug: 189851804
Test: atest StaticSharedLibsHostTests
Change-Id: Ia48cf95903bfc8ad194890b5408c8b1f96793ec4