Hide display white balance setting depending on color mode

Display white balance relies on a linear color transform matrix to work
as intended. When the current color mode is COLOR_MODE_SATURATED, this
condition is not guaranteed to be satisfied. In this case, hide the
display white balance setting.

Bug: 116516917

make ROBOTEST_FILTER=DisplayWhiteBalancePreferenceControllerTest
RunSettingsRoboTests -j32

Change-Id: I1fe1eb907485766888832db8b9c342339cc80ea7