Fix isPrivate check in case only one user is in the room.

src/net/java/sip/communicator/service/muc/MUCService.java

@@ -229,8 +229,8 @@ public static boolean isPrivate(ChatRoom chatRoom)
             {
                 for (ChatRoomMember member : chatRoom.getMembers())
                     if (nickname.equals(member.getName()))
-                        return false;
-                return true;
+                        return true;
+                return false;
             }
         }
         return false;