make tests green again

tests/template/ttempl.nim

@@ -17,7 +17,7 @@ const
 var i = 0
 for item in items(tabs):
   var content = $i
-  var file: TFile
+  var file: File
   if open(file, changeFileExt(item[1], "html"), fmWrite):
     write(file, sunsetTemplate(current=item[1], ticker="", content=content,
                                tabs=tabs))

tests/template/ttempl3.nim

@@ -3,7 +3,7 @@ template withOpenFile(f: untyped, filename: string, mode: FileMode,
                       actions: untyped): untyped =
   block:
     # test that 'f' is implicitly 'injecting':
-    var f: TFile
+    var f: File
     if open(f, filename, mode):
       try:
         actions