Fixes quick switch animation entering recents for low ram devices

This is a fix caused by a side affect from ag/2815906. The entrance
animation did not finish causing the incorrect animation. The flag
waitForTransition was set false too early and should have been set
to false once the entrance animation finishes not when the app
transition finishes.

Fixes: 65636735
Test: use low ram device, load apps, launch recents, continously tap
recents button

Change-Id: I8b13881082ba784c509d11e77b12c8c15739ad78