remove code that became dead as a result of the previous refactoring (to make files loadable from terminal)

imperative-shell/file-thread.sml

@@ -8,11 +8,6 @@ struct
   open FileMessage
   open InputMessage
 
-  val structureName = "Green"
-  val filename = "green.dsc"
-  val exportFilename = "green.sml"
-  val collisionFilename = "green-collisions.sml"
-
   fun loadIO (io, str) =
     case TextIO.inputLine io of
       SOME line => loadIO (io, str ^ line)
@@ -20,7 +15,7 @@ struct
 
   fun loadSquares (path, inputMailbox) =
     let
-      val io = TextIO.openIn filename
+      val io = TextIO.openIn path
       val str = loadIO (io, "")
       val () = TextIO.closeIn io
     in
@@ -52,7 +47,7 @@ struct
           SAVE_SQUARES {filepath, output} => saveString (filepath, output)
         | EXPORT_SQUARES {filepath, output} => saveString (filepath, output)
         | EXPORT_COLLISIONS {filepath, output} => saveString (filepath, output)
-        | LOAD_SQUARES filename => loadSquares (filename, inputMailbox)
+        | LOAD_SQUARES {filepath} => loadSquares (filepath, inputMailbox)
     in
       run (fileMailbox, inputMailbox)
     end