Update pois logic

[TimMcCauley]

As one poi can return multiple categories, we have to adapt the code in the client.

Before:

"properties": {
            "osm_id": 121252949,
            "osm_type": 2,
            "distance": 0.0,
            "category_id": 108,
            "category_name": "hotel",
            "category_group": "accomodation"
            "website": "http://www.hotel-muenchnerhof.com/",
            "name": "Bavaria Hotel M\u00fcnchner Hof",
            "phone": "+49 711 9257 00",
            "wheelchair": "no"
}

After:

"properties": {
            "osm_id": 121252949,
            "osm_type": 2,
            "distance": 0.0,
            "category_ids": {
                "108": {
                    "category_name": "hotel",
                    "category_group": "accomodation"
                }
            },
            "osm_tags": {
                "website": "http://www.hotel-muenchnerhof.com/",
                "name": "Bavaria Hotel M\u00fcnchner Hof",
                "phone": "+49 711 9257 00",
                "wheelchair": "no"
            }
        }

Code to change starting in $scope.locationsControl = ()..., just use the first category when you loop through.