Ken Rosato, longtime anchor of “Eyewitness News This Morning” on New York’s WABC 7, has been given the boot after allegedly making an off-color remark, Page Six has exclusively learned. Rosato was off the air when he uttered the phrase, we’re told, but an insider told us his remark was picked up “on an open mic” and was “immediately let go.” SNIP Our insider also doesn’t know what he uttered, but speculated that it could have been a “racial slur.” The former anchor’s bio has been wiped from the company’s website. His daily tweets from the anchor desk stopped on...