Only adds hidden app detail for normal apps

The new hidden app detail activity was being added to all packages being
installed, even static shared libraries, which may not have any
activities and which we do not want to surface to the user in launcher.

Change-Id: I80e7d379abed04f2464d1dc7e8b75456e43063f4
Fixes: 118145903
Test: atest android.os.cts.StaticSharedLibsHostTests