Add "pickleball" as value to Sports field

[tyrasd]

See https://github.com/openstreetmap/id-tagging-schema/blob/main/data/presets/leisure/pitch/pickleball.json, https://taginfo.openstreetmap.org/tags/sport=pickleball#overview

Similar usage as sport=padel which we already have a translated string for.

[github-actions]

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[matkoniecz]

listed on https://wiki.openstreetmap.org/wiki/Key:sport

I guess risk is low, but can you do

FYI, once this PR is merged, you can use the iD Editor Preview to test your changes in interaction with all other changes.

check?

[tyrasd]

looks fine:

[matkoniecz]

Maybe let's give people time to potentially comment but I would merge it soon

[matkoniecz]

If someone thinks it is invalid value or something else was bad with this PR, please comment.