Chicago aldermen on Wednesday grumbled their way through their approval of a $38.75 million settlement to resolve class-action litigation dealing with the city’s red-light and speed-camera systems.Many of the same lawmakers who sharply questioned Corporation Counsel Edward N. Siskel during Monday’s Finance Committee complained again about the program before voting overwhelmingly for the settlement.“This settlement will hopefully bring to a close a very embarrassing episode in the history of Chicago,&rdquo …