Fix uncautht OverscaledTileID error appearing with terrain enabled

[zbigniewmatysek-tomtom]

Fixes maplibre#1650.

Context

Negative zoom level were introduced by mapbox to handle displaying tiny maps. By negative zoom level they can scale down tiles. This PR is not questioning this design choice, just fixes issue with querying elevation caused by not handling negative zoom.

Problem

OverscaledTileID in getElevation() was constructed with negative zoomLevel (not allowed by tile spec) and thus threw uncaught error.

References:

• PR that introduced negative zoom levels: allow rendering full world smaller than 512px mapbox/mapbox-gl-js#9028
• Previous attempt to fix: fix: contraint zoom >= 0 maplibre/maplibre-gl-js#1733

Launch Checklist

• Confirm your changes do not include backports from Mapbox projects (unless with compliant license) - if you are not sure about this, please ask!
• Briefly describe the changes in this PR.
• Link to related issues.
• Write tests for all new functionality.
• Manually test the debug page.
• Add an entry to CHANGELOG.md under the ## main section.

[StylianosVitalis-TomTom]

Pretty neat! 🙌