By Rebecca Keegan
Los Angeles Times
LOS ANGELES
In America’s film the- aters, this has been a summer of women working badly: Kristen Wiig as an underachieving lassie of respect who trashes her friend’s spousal showering in “Bridesmaids”; Cameron Diaz as a pot-smoking center propagandize clergyman handing her bra to a tyro in “Bad Teacher”; Jennifer Aniston as a intimately rapacious dentist badgering her masculine partner in “Horrible Bosses.” Still to come: Anna Faris as a hard-partying slacker with a prolonged list of