Consolidate the header views updating into a single method

Call this updateView() in reset to ensure states are correct before animating.

bug: 341053089
Test: manually - video: https://drive.google.com/file/d/18ZSAEplL1Lk5ij3IHlwtRh1GQ6GhrXX1/view?usp=sharing
Flag: Aconfig com.android.launcher3.enable_private_space Nextfood
Change-Id: I2c825a7fd7d9a5faad8fbbb70d0f40294f715a42