Bubbles / notifs / shortcuts: if the id's don't match throw an error

It'd be weird if developers could specify different shortcut id's for
the bubble and the notification, so let's throw if they don't match.

Test: atest NotificationTest (needs the CTS CL)
Bug: 144352570
Bug: 138116133
Change-Id: I31106be6b278a2e599b100adf143bcfba8a9786d