Add Slovakia railway operators ticket offices

[Filip10]

Slovak national operator ZSSK
https://www.zssk.sk/
logo: https://www.zssk.sk/dizajn/fassets/img/logo_n.svg

"locationSet": {"include": ["sk"]},
"tags": {
        "operator": "Železničná spoločnosť Slovensko",
        "operator:wikidata": "Q393557",
        "name": "Železničná spoločnosť Slovensko",
        "short_name": "ZSSK",
        "website": "https://www.zssk.sk/",
        "shop": "ticket"
      }

Slovak national operator information offices
https://www.zssk.sk/
logo: https://www.zssk.sk/dizajn/fassets/img/logo_n.svg

"locationSet": {"include": ["sk"]},
"tags": {
        "operator": "Železničná spoločnosť Slovensko",
        "operator:wikidata": "Q393557",
        "short_name": "Zákaznícke centrum ZSSK",
        "name": "Zákaznícke centrum Železničnej spoločnosti Slovensko",
        "website": "https://www.zssk.sk/",
        "tourism": "information",
        "information": "office"
      }

Is it possible to exclude ZSSK from railway=station and power=catenary_mast? Because they do not own any of these. They are company operating just trains.

Private railway and bus operator operating also in Slovakia
https://regiojet.sk/
https://regiojet.cz/
logo: https://sk.wikipedia.org/wiki/RegioJet#/media/S%C3%BAbor:Regiojet_logo.svg

"locationSet": {"include": ["cz, sk"]},
"tags": {
        "operator": "RegioJet",
        "operator:wikidata": "Q221186",
        "name": "RegioJet",
        "shop": "ticket"
      }