Add dedicated preset for shelter_type=field_shelter (Resolves #851)

[ashree2118]

Description, Motivation & Context

added a dedicated, searchable preset for shelter_type=field_shelter.

Related issues

closes #851

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## Test-Documentation

### Preview links & Sidebar Screenshots

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<!-- FYI: What we will check:
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### Wording

- [ ] American English
- [ ] `name`, `aliases` (if present) use Title Case
- [ ] `terms` (if present) use lower case, sorted A-Z
<!-- Learn more in https://github.com/openstreetmap/id-tagging-schema/blob/main/GUIDELINES.md#2-design-the-preset -->

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[ashree2118]

Test-Documentation

Preview links & Sidebar Screenshots

test confirming the shelter_type=field_shelter exists as searchable preset

Wording

• American English
• name, aliases (if present) use Title Case
• terms (if present) use lower case, sorted A-Z

[matkoniecz]

BTW, it has icon in

id-tagging-schema/data/fields/shelter_type.json

Line 9 in 37b11ac

"field_shelter": "temaki-horse_shelter"

but is missing from dropdown...

[ashree2118]

yes it just has the key, type, label, and icons, and no options array

[matkoniecz]

reported as openstreetmap/iD#12026 as is not introduced by this PR and not an iD tag scheme bug