A LIFX bulb maintains its previous color even when the light is off.
For example, if the previous color is blue and the bulb is turned on
and then set to a red color, it will transition through purple colors.
After this commit, the target color is set while the bulb is still
turned off. This overrides the previous color and brightness that the
bulb remembered. The light is then turned on with the requested
transition duration.
For the example, this gives the expected result of only going through
red colors.