SecondsFormatterMixin:FormatZero ignores the formatters own convertToLower setting

[ndunsworth]

Current Impl

function SecondsFormatterMixin:FormatZero(abbreviation, toLower)
	local minInterval = self:GetMinInterval(seconds);
	local formatString = self:GetFormatString(minInterval, abbreviation);
	return formatString:format(0);
end

Expected Impl

function SecondsFormatterMixin:FormatZero(abbreviation, toLower)
	local minInterval = self:GetMinInterval(seconds);
	local formatString = self:GetFormatString(minInterval, abbreviation, self.convertToLower);
	return formatString:format(0);
end

This causes MySecondsFormatter:Format(0) to return "0 Sec" when initialized as MySecondsFormatter:Init(1, SecondsFormatter.Abbreviation.Truncate, false, true, true)