Fixes issue 3315 with VirtualPlayers

http://youtrack.sk89q.com/issue/WORLDEDIT-3315

worldedit-core/src/main/java/com/sk89q/worldedit/session/SessionManager.java

@@ -155,9 +155,7 @@ public class SessionManager {
             session.setBlockChangeLimit(config.defaultChangeLimit);
 
             // Remember the session if the session is still active
-            if (sessionKey.isActive()) {
-                sessions.put(getKey(owner), new SessionHolder(sessionKey, session));
-            }
+            sessions.put(getKey(owner), new SessionHolder(sessionKey, session));
         }
 
         // Set the limit on the number of blocks that an operation can