Show correct dialog for paused profile widgets

In Android U when the profile is paused, all its packages are suspended.
In this case getSuspendingPackage will return PLATFORM_PACKAGE_NAME, so
by that alone it is impossible to tell whether it is admin or not.

This CL changes the code so that quiet mode check takes precedence over
suspension check, so that the right dialog is shown for paused profile
apps.

This likely changes the behaviour in rare cases when the package is
suspended by admin as well, but this doesn't seem important.

Bug: 277715473
Test: manual with TestDPC and Calendar
Change-Id: I5e2edc28c324c0e7d95963c0b55a4b99e0af1833