Fix an old name shadowing bug in concrete syntax by removing the refresh pass

The refresh pass does not correctly keep track of the scope of local variables
and can convert things like \x->(\x->x) x into \x1->(\x2->x2) x2. Fortunately,
it appears that the refresh pass is not needed anymore, so it has been removed.

src/compiler/GF/Compile.hs

@@ -12,7 +12,7 @@ import GF.Compile.GeneratePMCFG
 import GF.Compile.GrammarToPGF
 import GF.Compile.ReadFiles
 import GF.Compile.Update
-import GF.Compile.Refresh
+--import GF.Compile.Refresh
 import GF.Compile.Coding
 import GF.Compile.Tags
 
@@ -196,8 +196,10 @@ compileSourceModule opts env@(k,gr,_) mb_gfFile mo@(i,mi) = do
       if tagsFlag then generateTags k mo3 else compileCompleteModule k mo3
   where
     compileCompleteModule k mo3 = do
-      (k',mo3r:_) <- runPass2 (head.snd) Refresh "refreshing" $
-                     refreshModule (k,gr) mo3
+--    (k',mo3r:_) <- runPass2 (head.snd) Refresh "refreshing" $
+--                   refreshModule (k,gr) mo3
+      let k' = k
+          mo3r = mo3
       mo4 <- runPass2 id Optimize "optimizing" $ optimizeModule opts gr mo3r
       mo5 <- if isModCnc (snd mo4) && flag optPMCFG opts
              then runPass2' "generating PMCFG" $ generatePMCFG opts gr mb_gfFile mo4