[openstreetmap/openstreetmap-website] Show notes more often (Issue #3971)

[mmd]

The issue here is in osm.js.erb: if mlon and mlat are set, we're not initializing "loc" from the _osm_location cookie. Later on we cannot set mapParams.layers, since "loc" should be nil at this time. This impacts both the notes layer, as well as the map layer.

```javascript
    } else if (params.mlon && params.mlat) {
      mapParams.lon = parseFloat(params.mlon);
      mapParams.lat = parseFloat(params.mlat);
      mapParams.zoom = parseInt(params.zoom || 12);
    } else if (loc = Cookies.get('_osm_location')) {
      loc = loc.split("|");
      mapParams.lon = parseFloat(loc[0]);
      mapParams.lat = parseFloat(loc[1]);
      mapParams.zoom = parseInt(loc[2]);
```

```javascript
    mapParams.layers = hash.layers || (loc && loc[3]) || '';
```

//CC:  fyi @AntonKhorev 

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