More than 12 million viewers tuned in to watch the Chicago Cubs advance to their first World Series in 71 years Saturday. The Cubs’ 5-0 victory over the Los Angeles Dodgers at Wrigley Field delivered an average audience of 9,706,000 viewers and a 7.17 overnight rating, making it the most-watched and highest-rated telecast in FS1 history, according to fast national figures released by Nielsen. The LCS telecast was the most watched of any network since 2010 (San Francisco…