Dialer: update dark theme colors

The dark theme colors exist in
java/com/android/dialer/theme/hidden/res/values/colors_dialer_light.xml
that would be used with AOSPThemeModule. As the app uses framework
dark theme instead of the module, copy the dark theme colors to
values-night.

Change-Id: I02a36b01ba581e62556ce6e0151ff0a35209467a