[riot-notifications] [RIOT-OS/RIOT] tests/unittests: test black corner case for color_rgb2hsv() (#9940)

benpicco notifications at github.com
Thu Sep 26 23:03:02 CEST 2019

It should suffice to test if `hsv.v` is within *epsilon* of 0.

![Screenshot at 2019-09-26 22-59-34](https://user-images.githubusercontent.com/1301112/65724844-8bc09c80-e0b1-11e9-95da-63d45928767a.png)

`hsv.h = 0` would be red anway.

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