Remove getInternalDisplayToken from ColorFade

There's no need for ColorFade to use the internal display token since it
already gets display info based on the displayId. It was only using the
display token to get colorMode but it's already stored in DisplayInfo

Test: ColorFadeTest
Bug: 242714168
Change-Id: I2261189135b21f9c34ed7a0120e111d0f3788da9