Brain Activity Visualizer doesn't work for surface simulation with Bold ROI monitor

The error received is a Javascript error: "The number of activity points should equal the number of surface vertices".

The message is pretty obvious, we should not test it against the number of surface vertices, but the number of regions for this monitor. By default, in the case of a surface simulation, this JS test is done with the number of surface vertices, so I think we should make an exception for this monitor.