By Nathan Vifflin (Reuters) -STMicroelectronics on Thursday forecast fourth quarter sales below market expectations, as weak automotive sales spoiled a recovery in its main markets, sending its shares lower. STM, which is one of Europe's largest chipmakers, expects fourth quarter revenue of $3.28 billion, up from the $3.19 billion it reported this quarter. That's below the average analyst forecast of $3.34 billion, according to LSEG data. The Franco-Italian firm, whose top clients include Tesla and Appl ...