2conllu: remove redundant fetch plaintext

Change-Id: I027cd5072a620f07fb35064e81315fc072053596
diff --git a/script/korapxml2conllu b/script/korapxml2conllu
index a3c0f0f..7f70440 100755
--- a/script/korapxml2conllu
+++ b/script/korapxml2conllu
@@ -233,7 +233,6 @@
         } else {
           $current .= join("\t", @conll[0..$columns-1]) . "\n"; # conll columns
         }
-        fetch_plaintext($docid);
         if ($sentence_ends{$docid}{$current_to}) {
           $log->debug("Using sentence end for $docid \@$current_to");
           $current .= "\n";