[openstreetmap/openstreetmap-website] Use webp tile format for tracestrack topo (PR #5996)

[Quinn]

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### Description
<!--Describe your changes in detail. If you have made changes to the UI, include screenshots. If your PR addresses a Github issue, please link to it.-->

Tracestrack Maps recently started providing webp tiles. webp is widely supported and have better compression. It loads faster.

### How has this been tested?
<!--Explain the steps you took to test your code.-->

The new tiles can be tested in Map Explorer: https://console.tracestrack.com/explorer#basemap=topo
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/5996

-- Commit Summary --

  * use webp format for tracestrack topo

-- File Changes --

    M vendor/assets/leaflet/leaflet.osm.js (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/5996.patch
https://github.com/openstreetmap/openstreetmap-website/pull/5996.diff

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