Make MessageWrapper static

git-svn-id: http://svn.code.sf.net/p/davmail/code/trunk@2269 3d1905a2-6b24-0410-a738-b14d5a86fcbd

src/java/davmail/imap/ImapConnection.java

@@ -723,7 +723,7 @@ public class ImapConnection extends AbstractConnection {
         sendClient("* " + currentFolder.recent + " RECENT");
     }
 
-    class MessageWrapper {
+    static class MessageWrapper {
         protected OutputStream os;
         protected StringBuilder buffer;
         protected ExchangeSession.Message message;