Copland: Fixing bad widget color

Thanks for your great Copland theme! I really like it (without the titlebars though xD).

Anyway, this is a small fix for the Copland battery widget.

**Bug description:** 
If your bat percentage drops below 14%, the bar color changes to a red-pink tone.
But if you recharge the battery and the percentage raises above 14% again (but is still lower than 51%) the red color remains.

This commit corrects this behaviour (so you always get a grey bar if bat_perc > 15).