Bypass VRaptor filter in WebSocket requests.

When you try to open a WebSocket connection to a @ServerEndpoint component in your application, the current implementation of the VRaptor filter prevents it from completing.

This fix allows WebSocket requests to bypass the VRaptor filter, hence, succeeding to establish the connection.
Since you have `isWebsocketRequest` you don't need the comment because the method name already did what's happening.