Update condition to elevate a sync adapter to ACTIVE.

In addition to forcing a sync adapter to the ACTIVE bucket if it's
a system package and the provider is not in the same package, now
also promote it to the active bucket if it has a shared uid with a
system package.

Bug: 196890576
Test: atest AppStandbyControllerTests
Test: atest ContentProviderTest [all]
Change-Id: I2d069939e7a4f10cc31e3987fb0a41e2f75c3fd4