Added unsigned specifier to default filter coefficients
Added unsigned specifier to default filter coefficients

BrewPi/firmware,BrewPi/firmware,BrewPi/firmware,glibersat/firmware,etk29321/firmware,etk29321/firmware,BrewPi/firmware,BrewPi/firmware,glibersat/firmware,BrewPi/firmware,BrewPi/firmware,BrewPi/firmware,glibersat/firmware,glibersat/firmware,etk29321/firmware,etk29321/firmware,glibersat/firmware,glibersat/firmware,glibersat/firmware,etk29321/firmware,etk29321/firmware