Add group_only=* field and don't ask for guest_house=*

[tiptoptom]

Description, Motivation & Context

group_only=* is recommended for tourism=hostel by the wiki.
guest_house=* is not recommended for tourism=hostel by the wiki.

Links and data

Relevant OSM Wiki links:

• https://wiki.openstreetmap.org/wiki/Tag:tourism%3Dhostel

Relevant tag usage stats:

tourism=hostel group_only: nodes: 36, ways: 117, relations: 3
tourism=hostel guest_house: nodes: 1699, ways: 1196, relations: 42

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### Wording

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