added a GetStringRectangle overload for backwards compatibility and to fix a compile error on the build
added a GetStringRectangle overload for backwards compatibility and to fix a compile error on the build

LithiumToast/MonoGame.Extended,rafaelalmeidatk/MonoGame.Extended,rafaelalmeidatk/MonoGame.Extended,cra0zy/MonoGame.Extended,Aurioch/MonoGame.Extended