Prefer more specific 'Crosswalk' preset over generic 'Crossing'
Many new users in my area are getting this wrong or skipping crossings entirely because:
1. Most crossings people want to map really are `crossing=zebra`.
2. 'zebra' is not a common term in the US so users don't know to pick it.
3. Popup help for 'Crossing' shows a zebra, so users think that's what they picked.