Return app hidden details activity in launcher api

If a normal app does not have launcher icon, launcher api
will return app details activity instead, so user will
be noticed that the app is still installed.

Bug: 111348460

Test: Installed an app without launcher activity, an app icon is being
shown in launcher allapps, and it forwards user to app details page.

Change-Id: I9c17f5edfdefe19727145e7176d7e113286c997d