I checked with three people that I consider to be "experts" in early learning materials. They all agree that there is no rule about the title page. So I would say that if the book is in uncontracted braille, the title page should be as well. However, if space is an issue, there is some precedent for the title page being done differently from the rest of the book: in Nemeth, the title page is done in literary braille. If you did decide to contract the title page, you would not be breaking any rules...as there aren't any at this point.