Toast app icon display is inconsistent for system apps

When an app is preloaded and it displays a toast, no app icon
is visible in the toast. If the app is then upgraded, and it
displays a toast the app icon is the visible in the toast.

This updates the logic to also include system apps when checking
if the app has a launch intent to decide whether to show an icon.

Test: Display a Toast in a system app, upgrade the system app
      and trigger the toast again. The app icon should be displayed
      in both cases.

Bug: 260568818
Change-Id: I9535b4599ba16cb3e4b224b9569259db1ec9ed36