Fix passing members to remove_members mailman binary.

src/mailman.scm

@@ -164,7 +164,7 @@
    (let ((result
 	  (get-mailman-output-lines
 	   "remove_members" listname
-	   (sprintf "\"~A\"" email))))
+	   (sprintf "~A" email))))
      (let loop ((lines result))
        (when (not (null? lines))
 	 (print " | " (car lines))