fix noise estimate in tensorProduct for CKKS
fix noise estimate in tensorProduct for CKKS

AlexanderViand/HElib,berserkr/HElib,AlexanderViand/HElib,shaih/HElib,AlexanderViand/HElib,berserkr/HElib,shaih/HElib,berserkr/HElib,shaih/HElib