coverity#1327464 Dm: Dubious method used

Change-Id: I7fb3182f181909a289f4253370904215518c1f23

swext/mediawiki/src/com/sun/star/wiki/WikiArticle.java

@@ -204,7 +204,7 @@ public class WikiArticle
             connPost.setDoOutput(true);
             connPost.connect();
 
-            OutputStreamWriter post = new OutputStreamWriter(connPost.getOutputStream());
+            OutputStreamWriter post = new OutputStreamWriter(connPost.getOutputStream(), "UTF-8");
             post.write("wpTextbox1=");
             post.write(URLEncoder.encode(sWikiCode, "UTF-8"));
             post.write("&wpSummary=");