Political deals don’t get any dirtier than this. Members of the all-Democratic City Council in suburban White Plains rewarded their party’s well-connected chairwoman with a plum six-figure judicial seat — even though she was too sickly to work, critics charge. City Judge Elizabeth Shollenberger — who suffers from a digestive disorder and morbid obesity, among other ailments — was unable to climb the three steps to her courtroom bench, even with the help of a specially installed railing, sources said.