Rotation: fix icons disappearing

Only the dynamic grid reload should be
stopping the launcher with intent to rebuild
the entire workspace.

This returns stopLoader to it's functionality
pre-dynamic grid resize patch.

Change-Id: I55861da83f9b640fd767031e0f2188c5b9b91e66
(cherry picked from commit 7d006588)
(cherry picked from commit 36fcac12)