The city’s casinos saw their operating profits rise by 5.8% in 2019 compared to a year earlier, according to earnings reports released Thursday. But part of that was due to big increases in profitability in the online operations of Caesars Entertainment Corp. and Resorts Casino Hotel. Only two of the seven casinos that operated for all of 2018 increased their profits in 2019: Borgata Hotel Casino & Spa, up 1.5% to $209.5 million, and Golden Nugget Atlantic City, up nearly 5% to nearly $47 million.