Gamblers furthered their preference for Ohio’s horse tracks over its casinos last month, with total gaming revenues at the state’s seven racinos growing nearly 10 percent while the state’s four freestanding casinos barely scratched out a 1 percent gain. The state’s casinos collected $65.5 million in gaming revenue in January, up from $64.8 million in the same month last year, according to figures released Monday by the Ohio Casino Control Commission.