move LineGap to start after loading file in shell.sml, and fix wrong parameter passed in mutually recursive function, in buffer.sml

fcore/buffer.sml

@@ -112,7 +112,7 @@ struct
        * call function to build next string *)
       continueBuildTextLineGap
         ( tl, acc, posX, posY, startX
-        , windowWidth, windowHeight, fWindowWidth, fWindowWidth
+        , windowWidth, windowHeight, fWindowWidth, fWindowHeight
         , r, g, b
         )
 

shell/shell.sml

@@ -5,7 +5,7 @@ struct
   fun ioToLineGap (io, acc) =
     case TextIO.inputLine io of
       SOME str => ioToLineGap (io, LineGap.append (str, acc))
-    | NONE => acc
+    | NONE => LineGap.goToStart acc
 
   fun main () =
     let