EAST BRUNSWICK, N.J. — “American Idol” finalist Jax says she’s battling thyroid cancer. MyCentralJersey.com reports (http://mycj.co/2aIoTjd ) Jax was diagnosed in the spring and underwent surgery to remove the thyroid and several lymph nodes. The 20-year-old singer and songwriter from East Brunswick became chronically ill with respiratory and exhaustion issues during her journey on “American