desktop: Change lock screen clock color list to wrap content

Wrap the color options instead of having them cut off horizontally when the window is narrow.

Screenshot on Desktop with flag on:
http://go/scrcast/NTcyNDc2NzgwOTE3NTU1MnwzYjA2OTE4MS1mOA
Screenshot on Phone with flag off:
http://go/scrcast/NDc0NjEyNDQ5MjUzNzg1Nnw2NzY4ZjljYS05Zg

Bug: 415902512
Test: Manually on DUTs
Flag: com.android.wallpaper.desktop_ui_flag
Change-Id: Ia58693a6eb887413ee8977634b50eacadc745b28