Add sport pitch icon

[finetjul]

Until a set of icon is chosen (#277), I think a sport pitch icon should be used because it is currently hard to read the map without this icon.
The one from maki seems to be generic enough and should fit pretty well.
https://www.mapbox.com/maki/

[matthijsmelissen]

Alternatively, we could change the landuse background to include an icon, such as we do for cemeteries for example.

[Schwitzd]

Any news about this improvement? read sport fields on the map is really difficult!
From the map I cannot understand with kind of sport is, I think is frustrating :(

[matthijsmelissen]

No, it seems nobody has had time to look at this yet.

[kocio-pl]

There's also another approach considered:

#1126

[HolgerJeromin]

This is a duplicate of #844 or the other way around.

[matthijsmelissen]

Thanks, closing as duplicate.