Disable "Learn more" button for unknown apps disabled by admin on secondary profiles.

Test: packages/apps/Settings/tests/robotests/src/com/android/settings/applications/appinfo/ExternalSourcesDetailsTest.java
Test: packages/apps/Settings/tests/robotests/src/com/android/settings/enterprise/ActionDisabledByAdminDialogHelperTest.java
Fixes:118881180
Change-Id: I8f6dbd9decba331fbe0a3495a2989f570f2afa67