Change icon for artwork_type=bust

[jragusa]

Related to #3565

Changes proposed in this pull request:
Use bust.svg icon for artwork_type=bust instead of generic artwork icon

Test rendering with links to the example places:
https://www.openstreetmap.org/node/3156678281
The upper right one is artwork_type=sculpture

Before

After

[Adamant36]

Although I'm generally in support of this, it only has 790 uses. Which is something to consider. Also, what's the diff between this and memorial=bust? The wiki isn't clear on it and I can't imagine a bust that's not a memorial. Otherwise, what would be the point in it? So the tag might be redundant. The example you provided is for the philosopher Jean-Jacques Rousseau. Am I correct to assume that its a memorial bust then? If so, it might be miss-tagging.

[kocio-pl]

It is sometimes much more clear if you have a statue or bust than if that is the artwork or memorial, so this is nice change.

[jragusa]

Yes there is only 790 occurrences of artwork_type=bust, but we have also more than 3000 uses of memorial=bust. Since icon is already use for the latter, It's not like adding a new icon and it contributes to grow the use of this icon to about 4000 features.

IMO, the difference between artwork and memorial is like between decorative and commemorative. And, yes, memorial tag is probably more suitable in the above example.

[Adamant36]

@jragusa, I agree. I was just wondering. I don't really see many decorative busts around. Not that I see that many commemorative ones either though I guess. I'd imagine most decorative ones would be in places like art galleries and most memorial ones would be in public spaces. That's about it as to my knowledge of these things (and its probably wrong), but I thought id ask. I still think its a good addition whatever the case.

[kocio-pl]

Thanks, it works as expected in my tests.