Respects text height behavior of the app

[chris-rutkowski]

Hello,

your package was missing this line what was making the text larger in some circumstances, like wrapping entire app in:

 child: DefaultTextHeightBehavior(
  textHeightBehavior: const TextHeightBehavior(
    applyHeightToFirstAscent: false, 
    applyHeightToLastDescent: false
),

Thanks for this package anyway. I'm about to greatly improve user experience in my financial app Commingle.