Ensure to clear RGB when entering clock mode

[repsej-h]

This ensures the RGB strip is off when the clock is displayed. Otherwise the WOPR is too bright to be used as a bedside clock.

[UnexpectedMaker]

It's been a long while - sorry! This is no longer needed in my V2 project due to the following commit: https://github.com/UnexpectedMaker/wopr/commit/f8ce710ec1618afefa30e37c31b29dcceb221269