[es6-bookreader-core/Mode2Up] Fix more type errors
[es6-bookreader-core/Mode2Up] Fix more type errors

- Removed unnecessary parseInts

openlibrary/bookreader,openlibrary/bookreader,internetarchive/bookreader,openlibrary/bookreader,internetarchive/bookreader,openlibrary/bookreader,openlibrary/bookreader