Can't change the "flag" in webVR.
Passing from a scene to another in weber, is
always a mix of BLEND and KEEPVIEW: horizontal look at (panning) is set to
0 and vertical look at (tilt) is get from the previous scene.
Setting or changing flag in skin_settings does not work on webvr.
Is this the standard flag for webvr?
Reported on iOS with krpano 1.19-pr14