Small improvments.

Hi

Nice and user friendly map. Something one can recommend to look up for example opening_hours :smile:. To finally fix [Does not evaluate opening_hours attached to OSM ways](https://github.com/ypid/opening_hours_map/issues/1) I read parts of your JavaScript code base. Looks nice too :+1:. I fixed a few minor things.

I should note that I don‘t use your solution to get the coordinates of OSM way. I found a better way described in the issue linked above.

Another thing. Your map would not be able to evaluate opening_hours using [holidays](wiki.openstreetmap.org/wiki/Key:opening_hours:specification#holiday). You can check out a patch I wrote for the [Ulm API](https://github.com/cmichi/ulm-opening-hours/pull/4) how to implement this..