Fix the hardcoded "phone" in COMPUTER summary

ag/33149787 fixed the app name regression but removed the device type
handling. Adding it back and removing the custom COMPUTER profile
logic in the activity.

No-op for phones, device name will be correct on tablets and other
devices.

Bug: 411421690
Test: presubmit & manual
Flag: EXEMPT trivial bugfix
Change-Id: I6c4f1142c0b84040a285ea2738f138b0e12b5edb