Change the font size and text color of wallpaper info view to fulfill the latest spec.

Spec:
https://www.figma.com/file/ZMWLsRp1hBHSrC7D4fncxd/R-Customization-Picker?node-id=90%3A17548

Screenshot:
https://screenshot.googleplex.com/BNiuxJFLKFAV74u.png (light theme)
https://screenshot.googleplex.com/7NPMHqAvG4Tokcc.png (dark theme)

Bug: 166466904
Change-Id: I4d082636ab7bcdac7d0b58830770fced621218f3
4 files changed