Frederick Scott Salyer knew his telephone calls from jail on March 30 were being recorded.When you're a multimillionaire Titan of Tomatoes, getting used to the rules of the Sacramento County Main Jail may be a real drag. Frederick Scott Salyer, the 54-year-old former head of SK Foods LP who is awaiting trial in the jail on federal charges of corruption, bribery and of trying to corner the market on tomato paste, already has learned the hard way that telephone conversations there are recorded and may be used by prosecutors. Now he's learning how mail is handled. Court papers filed by prosecutors say that last week a defense paralegal "brought a handful of personal letters directly to (Salyer) in the lineup room," where the defense team works with him.