[Do Not Merge] Revert "Implement a global maximum on number of shortcuts an app can publish"

This reverts commit ff75f06d.

Reason for revert: bugs related to conversation shortcuts can lead to system retaining shortcuts exceeding this number, causing crashes in chat apps such as whatsapp, messages ... e.t.c

Change-Id: I3440b852dbedf5d5bab4f1d552fe7aaa58a6da91