Revert "Temporarily disable Launcher3 tests affected by fling changes"

This reverts commit bc4dc49c.

Reason for revert: RecyclerView bug is fixed

Change-Id: Ia2a677f3a3987751349bad951ff136b2d55f439f
Merged-In: Ia2a677f3a3987751349bad951ff136b2d55f439f
Test: presubmit
Bug: 197802324
(cherry picked from commit 8b4a6ee6)