Amend wording of clipboard access notification.

This corrects the wording of the clipboard access notification
as per UX specification. The current wording is "<app> pasted from
clipboard". It should be "<app> pasted from your clipboard".

Bug: 179469804
Test: Build and flash, copy and paste and check wording
Change-Id: I965690515c9c1fcf92553992a5d67507d0f1b855