The 51-year-old Ozone Park woman gunned down in her own home was a tarot card reader who cops believe was slain by a disgruntled customer who thought she was a “witch” who had cursed him, sources said. Guiseppe Canzani, 41, who is facing murder charges in the broad-daylight shooting of 51-year-old Anna Torres on Wednesday, had gotten into a dispute with her outside the Queens home in recent days, the sources told The Post. He told cops he shot Torres “because she was a witch” and that she had put a spell on him and cursed him, one source said....