変更前
  <script>
      var map = L.map('map').setView([33.08289779732226, 132.50748297053673], 17.5);
      L.tileLayer('http://localhost/{z}/{x}/{y}.png', {
        minZoom: 15,
        maxZoom: 20,
        tms: false,
        attribution: 'Generated by TilesXYZ'
      }).addTo(map);
  </script>

変更後
  <script>
      var map = L.map('map').setView([33.08289779732226, 132.50748297053673], 17.5);
      L.tileLayer('http://iwaiwa.c.ooco.jp/leaflet/{z}/{x}/{y}.png', {
        minZoom: 15,
        maxZoom: 20,
        tms: false,
        attribution: 'Generated by TilesXYZ'
      }).addTo(map);
  </script>