montage: skip pixbounce

Segfaults were observed when montage came up in rtv, since pixbounce
doesn't seem to be rendering properly at all just skip it for now.

I suspect what's happening is rtv ran pixbounce before running montage,
and pixbounce caches fragment knowledge @ initialization.  So when
montage ran pixbounce in a tile, that stale fragment knowledge was used
and caused scribbling.

Stars probably has similar problems actually.

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