change ticket_validator icon to ticket

[matkoniecz]

requested by #1387

would reduce confusion with generic vending machine, increase confusion with machine selling tickets, not sure which is worse

proper fix for #1387 would be a new icon

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[dokutan]

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[dokutan]

I personally find this icon an improvement over the old temaki-vending_machine icon.

If ticket validators and ticket vending machines should have different icons, there is the fas-ticket-alt icon (already used for shop=ticket) which could also be used for ticket validators:

[matkoniecz]

maybe with checkmark superimposed on this? if someone wants to make a new icon

but this may be a bit too crowded

[tordans]

Current icon:

https://rapideditor.github.io/temaki/docs/

[tordans]

I think this is an improvement to what we have now, so lets use this until someone creates an even better icon.