Launcher: "No more room on this Home Screen" will prompt twice.

"No more room on this Home Screen" message will prompt twice.
Once while drag from all apps menu , once while the home
screen(Workspace) check if can accept drop from all apps menu.

We need cancel the latter prompt message.

Change-Id: Idb7da2b963266477641827b3fd93ceb29d32893c
CRs-Fixed: 399743