delete some dead code

shell/shell.sml

@@ -69,7 +69,7 @@ struct
         let
           val searchString = "val "
           val (buffer, searchList) =
-            SearchLineGap.build (#buffer app, searchString)
+            SearchList.build (#buffer app, searchString)
           val buffer = LineGap.goToStart buffer
         in
           AppWith.searchList (app, searchList, buffer, searchString)

shell/update-thread.sml

@@ -33,9 +33,6 @@ struct
       val app = AppUpdate.update (app, inputMsg)
                 handle e => ExceptionLogger.log e
 
-      val searchList = #searchList app
-      val searchList = SearchList.toString searchList ^ "\n"
-
       val () = sendMsgs (#msgs app, drawMailbox)
     in
       loop (app, inputMailbox, drawMailbox)