Fixes #949 Add OSM OpenMapTiles to style gallery list (#956)

## Launch Checklist

Add OSM OpenMapTiles to style gallery list
Fixes #949

Before

![image](/~https://github.com/user-attachments/assets/49e39bdd-9920-4ba3-b68f-3e423fae8d7f)

After

![image](/~https://github.com/user-attachments/assets/370e8aaf-7b96-4ba6-a79d-362c38c3e736)



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src/config/styles.json

@@ -65,6 +65,12 @@
     "url": "https://maputnik.github.io/osm-liberty/style.json",
     "thumbnail": "https://maputnik.github.io/thumbnails/osm-liberty.png"
   },
+  {
+    "id": "osm-openmaptiles",
+    "title": "OSM OpenMapTiles",
+    "url": "https://api.maptiler.com/maps/openstreetmap/style.json?key=get_your_own_OpIi9ZULNHzrESv6T2vL",
+    "thumbnail": "https://openmaptiles.org/img/styles/openmaptiles.png"
+  },
   {
     "id": "positron",
     "title": "Positron",