allow to search presets by tag

[tyrasd]

Some people might remember a preset by its OSM tag, or want to look up a preset which matches a tag documented in the OSM wiki.

The preset search bar could show presets if (one of) their tags matches the entered search text (e.g. landuse=railway should match the Railway Corridor preset). This could also be relaxed to match any one or two word input which corresponds to an OSM tag's key and/or value.

See openstreetmap/id-tagging-schema#301

[1ec5]

The search results already include matches based on the value, but not the key=value syntax:

iD/modules/presets/collection.js

Lines 124 to 126 in fc6c711

	// matches value to preset.tags values
	const leadingTagValues = searchable
	.filter(a => Object.values(a.tags || {}).filter(val => val !== '*').some(leading));