Remove TaskbarLauncherStateController#setIconAlpha()

Instead use setTaskbarViewVisible directly. Now that we stash when going to overview, we shouldn't have any launcher state where we need to fade out TaskbarView icons

Test: quick switch from home (follow up CL)
Bug: 194728611
Change-Id: I03e1fa4037b7e8a08494f6b7e065d144c4bc4e1b
1 file changed