Remove (teardrop) page indicator

[ggeisler]

The page indicator at the bottom of a multi-image object should be removed. Currently, the indicator looks too much like a control and isn’t one, and page numbers don’t update properly. It doesn't seem like a good tradeoff for using up a row of the viewer

---

We might reassess if the element could actually work as a slider control, but even then it seems mostly redundant with the scrollbar in the Thumbnails view (though it might provide unique value if you are using the Index view instead).

[edsilv]

In config:

"searchFooterPanel": {
      "options": {
        "positionMarkerEnabled": false
      }
    },

[mejackreed]

I think this only displays on items with a IIIF search service. At the moment, I do not believe any of our objects have this behavior.