Wallpaper Quick Switcher Reload (2/3)

Ensure that wallpaper preview and color section reload to show new
wallpaper and new colors when a wallpaper in the wallpaper quick
switcher section is selected. This was not the case when system colors
is set to a basic color.

Bug: 270193793
Test: Manually tested--wallpaper preview and colors reload when an
option in wallpaper quick switcher section is selected, whether system
color is set to a wallpaper color or a basic color, and made sure that
there is no significant lag. Also made sure picker is unchanged and
funactional with revamped UI flag turned off
Recording - https://drive.google.com/file/d/1PEjnJPT2h2UfcWALxkYCFZmY8QMMj4rV/view?usp=sharing&resourcekey=0-jOw5CvSA5zacuvAeDTniMQ

Change-Id: I2995f28ed7d0e7bc77ba43919ece81af7f66fc7f