v4 preprocessor: corrected bug with initval_file

git-svn-id: https://www.dynare.org/svn/dynare/dynare_v4@1793 ac1d8469-bf42-47a9-8791-bf33cf982152

ParsingDriver.cc

@@ -307,8 +307,8 @@ ParsingDriver::init_val(string *name, NodeID rhs)
 void
 ParsingDriver::init_val_filename(string *filename)
 {
-  options_list.num_options["INITVAL_FILE"] = 1;
-  options_list.string_options["INITVAL_FILENAME"] = *filename;
+  options_list.num_options["initval_file"] = "1";
+  options_list.string_options["initval_filename"] = *filename;
   delete filename;
 }