When getting a list from Facebook, don't include "picture" twice in the ...

...fields, to prevent the error "Syntax error "Field picture specified more than once. This is only possible before version 2.1" at character 48: id,picture,type,from,message,status_type,picture,object_id,name,caption,description,link,created_time,comments.limit(1).summary(true),likes.limit(1).summary(true)" from the API.