The Manhattan mistress of married “60 Minutes’’ newsman Steve Kroft sent him sexy lingerie photos during their affair, but he insisted she dress low-key — like “Laura Bush” — with him in public to keep things hush-hush, according to newly revealed texts. A source close to Kroft’s lover told The Post that the TV hotshot was “really paranoid about right-wing zealots” finding out about their affair and using the tawdry details to try to destroy his career and CBS. [Snip] Kroft was proud to boast to Goines about his closeness to the leader of the free world — and let...