[openstreetmap/openstreetmap-website] Use webp tile format for tracestrack topo (PR #6016)

[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 has better compression. It loads faster without noticeable quality degradation. It helps us save bandwidth and also computing power. Our new rendering stack outputs webp by default.

### 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/6016

-- Commit Summary --

  * use webp format for tracestrack topo
  * Merge branch 'openstreetmap:master' into master

-- File Changes --


-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/6016.patch
https://github.com/openstreetmap/openstreetmap-website/pull/6016.diff

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