[Output Switcher] add check on animation

check if animation on seekbar is needed, if it's launching for first
time, skip animation.

Test: verified on device
Bug: 234412421
Change-Id: Id2a84c0734ebeee037722452ae91b1dfb8b18cac
(cherry picked from commit 8cc360e9654737656d0d0673a9aa800992521779)
Merged-In: Id2a84c0734ebeee037722452ae91b1dfb8b18cac