Per user setting for instant app

The same application can run as either an instant app or an installed
app. Store this setting per-user instead of based upon the install
location.

Bug: 25119046
Test: cts-tradefed run commandAndExit cts-dev -m CtsAppSecurityHostTestCases -t android.appsecurity.cts.EphemeralTest
Change-Id: Iff565bb1ac10d631499f0bd0f69b401cb073c10e