People seem to be divided into two camps: those who adore writer-director Richard Curtis’ 2003 holiday rom-com “Love Actually,” and those who can’t abide the film’s heart-meltingly grand gestures, wryly feel-good vibe and bittersweet, ain’t-love-grand charms. But this much is true: If you’re a fan of “Love Actually,” you’ll probably feel right at home at “Love Actually Live,” the rousing, …