Change sample daytime temperature to 6500

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Changing daytime temperature in sample config file to 6500.

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When I used redshift on my mac, I noticed that I get a red hue when I use a daytime temperature of 5700. I changed it to 6500, but I think since some people may just copy / paste the redshift.conf file, it is better to use a sensible default of 6500 instead of 5700, so the screen looks correct.

Maybe other operating systems like Linux or Windows use 5700 by default, I don't know. This is me testing on my MacOS Big Sur 11.3.