It's no laughing matter to Viacom that AT&T could be dropping its channels from DirecTV and U-verse in just a couple of day but Comedy Central's The Daily Show became the battlefield in the latest pay-TV carriage war tonight. As host Trevor Noah listened to Neal Brennan's mordacious takedown on the recent rise of socialism in political rhetoric (HINT: blame the rich) on the deliberately fake news show on Tuesday, a warning appeared on the bottom of the screen for a few…