Cancel exit spring loaded runnable when launcher state is set to APPS or WIDGETS

b/29645452

By cancelling the runnable, we are enabling transition:
state1 -> state3 instead of state1-> state2-> state3.
Transition state1->state3 is a viable transition that is
supported by our model.

        Launcher           Workspace
--------------------------------------------
state1  APPS_SPRING_LOADED SPRING_LOADED
state2  WORKSPACE          NORMAL
state3  APPS               NORMAL_HIDDEN


Change-Id: If27905567efe439324494e0091a4b42fcbf01448