fontForTextStyle(_ style: maximumPointSize:) doesn't use maximumPointSize parameter in the implementation

[staskus]

fontForTextStyle(_ style: maximumPointSize:) doesn't use maximumPointSize parameter in the implementation. This method is used in some parts of the WordPress-iOS application and is features in the accessibility guide.

It was removed in the #294 PR.

    @objc public class func fontForTextStyle(_ style: UIFont.TextStyle, maximumPointSize: CGFloat = maxFontSize) -> UIFont {
        let fontDescriptor = UIFontDescriptor.preferredFontDescriptor(withTextStyle: style)
        return UIFont(descriptor: fontDescriptor, size: fontDescriptor.pointSize)
    }

a) If we don't want to support maximumPointSize anymore, remove it from method signature.
b) If we want to support maximumPointSize change implementation to use fontDescriptor method that uses maximumPointSize.